Ah - there are formulas creating the values in the column that you are sorting on ..
I am unable to recreate your issue, as you can see below
BEFORE
Excel 2016 (Windows) 32 bit
[TABLE="class: head"]
<tbody>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]
[TH][/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]C[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]D[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]E[/COLOR]
[/TH]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]20[/COLOR]
[/TD]
[TD]Value
[/TD]
[TD]Code
[/TD]
[TD] Formula
[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]21[/COLOR]
[/TD]
[TD]1
[/TD]
[TD]05[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C21,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]22[/COLOR]
[/TD]
[TD]4
[/TD]
[TD]AA[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C22,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]23[/COLOR]
[/TD]
[TD]5
[/TD]
[TD]DD[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C23,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]24[/COLOR]
[/TD]
[TD]2
[/TD]
[TD]26[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C24,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]25[/COLOR]
[/TD]
[TD]3
[/TD]
[TD]09[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C25,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="class: grid"]
<tbody>[TR]
[TD]Sheet:
Sheet1[/TD]
[/TR]
</tbody>[/TABLE]
AFTER sort A to Z
Excel 2016 (Windows) 32 bit
[TABLE="class: head"]
<tbody>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]
[TH][/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]C[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]D[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]E[/COLOR]
[/TH]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]20[/COLOR]
[/TD]
[TD]Value
[/TD]
[TD]Code
[/TD]
[TD] Formula
[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]21[/COLOR]
[/TD]
[TD]1
[/TD]
[TD]05[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C21,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]22[/COLOR]
[/TD]
[TD]3
[/TD]
[TD]09[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C22,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]23[/COLOR]
[/TD]
[TD]2
[/TD]
[TD]26[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C23,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]24[/COLOR]
[/TD]
[TD]4
[/TD]
[TD]AA[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C24,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]25[/COLOR]
[/TD]
[TD]5
[/TD]
[TD]DD[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C25,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="class: grid"]
<tbody>[TR]
[TD]Sheet:
Sheet1[/TD]
[/TR]
</tbody>[/TABLE]
AFTER sort Z to A
Excel 2016 (Windows) 32 bit
[TABLE="class: head"]
<tbody>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]
[TH][/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]C[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]D[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]E[/COLOR]
[/TH]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]20[/COLOR]
[/TD]
[TD]Value
[/TD]
[TD]Code
[/TD]
[TD] Formula
[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]21[/COLOR]
[/TD]
[TD]5
[/TD]
[TD]DD[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C21,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]22[/COLOR]
[/TD]
[TD]4
[/TD]
[TD]AA[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C22,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]23[/COLOR]
[/TD]
[TD]2
[/TD]
[TD]26[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C23,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]24[/COLOR]
[/TD]
[TD]3
[/TD]
[TD]09[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C24,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]25[/COLOR]
[/TD]
[TD]1
[/TD]
[TD]05[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C25,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="class: grid"]
<tbody>[TR]
[TD]Sheet:
Sheet1[/TD]
[/TR]
</tbody>[/TABLE]
(a guess
) Would adding another column and sorting on that work (see F below)
Excel 2016 (Windows) 32 bit
[TABLE="class: head"]
<tbody>[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "]
[TH][/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]C[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]D[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]E[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]F[/COLOR]
[/TH]
[TH][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]G[/COLOR]
[/TH]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]20[/COLOR]
[/TD]
[TD]Value
[/TD]
[TD]Code
[/TD]
[TD] Formula
[/TD]
[TD]Try ??
[/TD]
[TD] Formula
in F
[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]21[/COLOR]
[/TD]
[TD]5
[/TD]
[TD]DD[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C21,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[TD][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FF0000]#FF0000[/URL] ]DD[/COLOR][/TD]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FF0000]#FF0000[/URL] "] =D21[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]22[/COLOR]
[/TD]
[TD]4
[/TD]
[TD]AA[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C22,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[TD]AA[/TD]
[TD] =D22[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]23[/COLOR]
[/TD]
[TD]2
[/TD]
[TD]26[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C23,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[TD]26[/TD]
[TD] =D23[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]24[/COLOR]
[/TD]
[TD]3
[/TD]
[TD]09[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C24,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[TD]09[/TD]
[TD] =D24[/TD]
[/TR]
[TR="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] "]
[TD="bgcolor: [URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=E0E0F0]#E0E0F0[/URL] "][COLOR=[URL=https://www.mrexcel.com/forum/usertag.php?do=list&action=hash&hash=FFFFFF]#FFFFFF[/URL] ]25[/COLOR]
[/TD]
[TD]1
[/TD]
[TD]05[/TD]
[TD] =IFERROR(INDEX('ActvRateCat SumRpt'!C:C,MATCH(C25,'ActvRateCat SumRpt'!B:B,0)),"")[/TD]
[TD]05[/TD]
[TD] =D25[/TD]
[/TR]
</tbody>[/TABLE]
[TABLE="class: grid"]
<tbody>[TR]
[TD]Sheet:
Sheet1[/TD]
[/TR]
</tbody>[/TABLE]