Can't move CR rule in list

[sparky2205]

Hi folks,
in the screenshot below I'm trying to move the highlighted rule to the top of the list but when I try I get the message shown.
If I try to move the top rule down I get the same message.
I've never encountered this before.
Anyone know why this is happening?

 

[Joe4]

Do you have any sort of protection on the workbook or worksheet?

 

[sparky2205]

Neither the workbook or worksheet are protected.

 

[Peter_SSs]

Have you tried saving, closing Excel completely and re-opening?

Is it happening in 365 or 2016 or both?

 

[sparky2205]

I deleted the CF and recreated it and of course now it works fine.
A glitch of some sort I presume.
Thanks for the responses guys.

 

[Peter_SSs]

Glad you got it working. Thanks for letting us know.