I have a problem with Excel intermittently and mysteriously changing the sequence of rules in a 9-rule conditional format, sliding rule 6 up to the top to become rule 1. It happens at random intervals, sometimes multiple times per day and sometimes not for a few days, even though the column of affected cells is locked and cannot be selected when the sheet is protected.
The temporary fix is to unprotect the sheet, select the column of affected cells, go back into conditional formatting to manage rules, shift the 1st rule back down to the 6th position where it belongs, and protect the sheet again.
I am running Office 365 Home under Windows 8.1, and would appreciate help from anyone who has a fix.