Excel editing Conditional Formating rules cursor issue

I've started encountering this issue a few months ago. It is extremely disruptive, as I work with Named Ranges a lot. I encounter it on multiple machines using the same Office 365 license. My work colleagues suffer from it as well.

I've found that I can sometimes right it by jumping between worksheets and doing... something - but I haven't quite figured out what it is yet.

EDIT: OK, I think I've figured out what's causing it: it happens when I scroll my sheet horizontally away from the leftmost position. Once I scroll to the beginning of the sheet, the cursor gets placed in the clicked position inside popup formula boxes correctly.