I tried overcloacking my monitor

Sep 11, 2018
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So i tried overcloacking my monitor and change it's refresh rate because when i first saw that i was like wow thats cool and tried it at first i had no problems but then i launched fortnite and tried to fullscreen and then tried to go to desktop and it said "Invaild format" then go back to fortnite (alt+tab) and it worked, and another monitor shows the pc, and my monitor somehow detect the computer somehow when games are at fullscreen(tried that with other monitor) but not all the computer it detects...
Somebody have a fix?

Have GTX 1050 Ti