i5-13600KF
GTX 3070
16GB RAM
Game is installed on an SSD.

So far I haven't had any issues with my game, but after a minute or two of running, the game shifts over to my second monitor and won't go back to my primary one. What's going on here? Is there a way to fix this?

Pressing Alt-Enter to exit fullscreen, dragging it onto the left monitor and re-activating fulllscreen works SOMETIMES: Sometimes it will stay there for a while, sometimes it will immediately shift back to the second monitor.