I am trying to apply a new conditional formatting rule and it is not working

[Derquila]

Hello and let me apologize up front for this question.

I am trying to apply a new conditional formatting rule and it is not working

The rule is simple but it seeems to be formatting randomly. There are no other rules in the workbook. Column C is =B1>A1 etc.
Format where true =$B1>$A1
Apply to =$B$1:$B$19

 

[Peter_SSs]

You just need to write your CF formula as it applies to the very first cell in the range you are applying it to,

Strictly speaking, it needs to be written as it applies to the active cell, not necessarily the 'first' cell in the applicable range.