Fortnite runs worse on my 1st montior than my 2nd monitor?

[tac0totodile]

Fortnite suddenly started running at less than 30 fps on my first monitor, but runs perfectly fine on my 2nd monitor, anyone have any tips to help me out here?

 

[terry4536]

The only thing I can think of would be different resolution settings assuming that everything else is the same. Look into the display settings, monitor refresh rates, and resolution.