Fullscreen not working

Hello, I overclocked my monitor and until yesterday it could run Overwatch fullscreen just fine. However, today I was not able to play fullscreen without switching back to 60 Hz. My drivers are updated and I ran the repair and scan tool already. Is there any fix to this other than playing on 60 FPS? Thanks!

Edit: It works now out of the blue. For people with the same issue, all I did was restore defaults in NVIDIA Control Panel and then overclock my monitor again.