Weird Choppy Issue When Fullscreen

Just got a new PC and monitor, booted up hots and the game looks very weird and jittery. Everything has a choppy look, especially noticeable on things that move constantly (i.e. Brightwing flapping). Changing to Windowed Fullscreen fixes this and it looks smooth. I’m trying to run it at 1920x1080 144hz, have it set as this but looks very strange. Has anyone had this issue too?