I am a new player to private servers and this was my first choice by far. Although I sadly have managed to get a bug that makes this game unplayable. To explain specifically, my camera sensitivity in game seems to be erratic and not 1 static number. Randomly and frequently while I'm holding down my left and right mouse button to move around and move my camera angle; the sensitivity of the camera will randomly jump to a ridiculous sensitivity that makes me go in a direction that wasn't intended just about every time it happens. It is very irritating. The second issue I have is with my mouse cursor. When moving my mouse cursor to click on an object or in any direction my mouse cursor will randomly be put back to the center of my screen. But that's only the first part of this issue, also when I click in a direction anywhere on the screen it will sometimes force my camera angle to change when I do not want it to. This entire experience is very irritating and if anyone has a solution I would really appreciate it because even after only 20 minutes of actually playing I do think I'm going to enjoy this community.
That's caused my the cursor resetting randomly to the center of the screen. It happens in Legion client as well, and no, overlays apparently don't affect it(tested). You're stuck with this glitch.
My friend had same issues and it was due to something called cursor accelerator or mouse accelerator, which was installed while he got the mouse, he had to delete or inactivate it since it ruined every game for him, specially first person shooters.