I’ve found a solution to a problem I was having that seems to me to be similar to this problem, and it’s pretty simple.
Under the Camera Settings tab on my pawn’s camera I had at some point checked Use Pawn Control Rotation. Unchecking this fixed the issue for me.
My issue might have been different though; for instance movement with the headset was actually inverted (e.g. moving my head forward caused the ingame camera to move backwards), and it seemed like the pivot point when turning with the mouse wasn’t at the center of the camera.
That being said, if anyone is having the same problem as me, I figure it’s worth it for me to put this here instead of starting a new thread, because this thread seemed to be describing the issue I had.