The conditional format expression used requires that
have matching data. Is the data in these fields numbers or text?
My hypothesis here is that you have text in these fields and that the switch in languages is producing a change that keeps them from evaluating as equal. Perhaps that button changes the value in one field and not the other?
Otherwise, I can't imagine why your button to change languages would produce this result.
Thank you for all the help you provided. I was able to find the source of the issue. It wasn't related to the conditional formatting but to data formatting conflicts (data formatting vs layout formatting). I used another one of your threads to solve the issue.