Basically what happens is in the picture. When I leave excel open too long, or when I have to switch windows and return to excel, I get the bug. Can't search it on the web bc I can't quite explain this. Not to mention it sucks because I have to restart excel every time this happens.
This is MS Excel 2016 PP, 64bit. My machine runs on 8GB RAM, i5-5005U 2.3 GHz. I want to have MS repair the application, but I don't really have the time to go through that.