>sorry i don't really understand this
I mean when you just move the mouse right/left, rotating the player's look direction. The camera seems to be offset from the physics capsule, rather than centered. This causes the camera to move in a circle around the capsule instead of just pivoting on a spot. While not strictly bad, many FPS, that I recall, use a centered camera to avoid that effect. For example, walk so that you're kissing one of the enemy spawners. Then move the mouse right/left, you'll rotate around the spawner instead of spinning in place like one would expect.
Hope that's clear and of use to you.