Help needed for odd. If

My game suddenly has started doing this thing where a white bar will appear across the top of the screen as if I am in a windowed mode of some kind, but I can’t put my mouse on this bar and the bottom of the screen becomes unusable for panning. Going into settings and switching back and forth between windowed modes or any of the others does nothing. And force minimizing the game also has no effect. Never had this happen and just lost three straight games because of it. Anyone have experience with this or advice on how to fix? My game is up to date, and so are my drivers. Windows 11 if that helps. Thanks in advance :)