Change the data in Khloe's cell so it reads 08:00-18:00.
Does this cure the problem?
If so then its because Khloe's cell has two time durations (as does Lodkin's) and Ada's only has one time duration
Images are of little use in this aspect.
Can you post your formula?
=IF(INDEX(SCHEDULE!$C:$C,MATCH(RESULT!$A51,SCHEDULE!$A:$A,0))="","",TEXT(MIN(IFERROR(TIMEVALUE(LEFT(INDEX(SCHEDULE!$C:$C,MATCH(RESULT!$A51,SCHEDULE!$A:$A,0)):INDEX(SCHEDULE!$C:$C,MATCH(RESULT!$A52,SCHEDULE!$A:$A,0)-1),5)),1)),"hh:mm")&" - "&TEXT(MAX(IFERROR(TIMEVALUE(MID(INDEX(SCHEDULE!$C:$C,MATCH(RESULT!$A51,SCHEDULE!$A:$A,0)):INDEX(SCHEDULE!$C:$C,MATCH(RESULT!$A52,SCHEDULE!$A:$A,0)-1),7,5)),0)),"hh:mm"))
Is it cos of the order of the names?
Your formula refers to the next name down A53 A54 etc
There is no name below Khloe's on the output.
Put the names int he same order.
I suspect Khloe's will correct itself but then Loaklin's will go wrong.