Game resolutions messes up every other game.

Hello & thank you for taking some time to read this!

I've been playing crossfire for a very long time now, and a couple of months ago I started to get this issue.
After one update (Can't remember wich one) each time I started a second game, my resolution would be all messed up and I was only able to see like half my screen. Since then every single time I finish my first game, I have to shut down crossfire completely & restart the game. Only the first game after launching the game works like it should. After this first game, every single time I start a new game the resolution is all messed up and just unplayable. When I had this issue back then, I didn't really care that much because I wasn't playing crossfire that much. But now that I want to start playing seriously again I'd have to restart my game after every single game I play.

Does anybody know ANY advice at all?

Kind regards Krypton

(PS: I already reinstalled my game, YES my drivers are up to date and no I do not have any viruses on my pc)