Conditional Formatting Bug

Conditional Formatting Bug

I'd like to highlight cells in an area based on a formula. The area is J6:AU44. The formula is

  1. =ISEMPTY(J6)*($G6>0)*(J$1<>"")

It works. But after a while, I don't know what exactly is the trigger, the formula changes on a magical way to

  1. =ISEMPTY(A1)*($G1>0)*(A$1<>"")