Movement with mouse (blocked)

I’ve had this problem for a week or two now.
When I hold in mousebuttons left + right, it’s supposed to move forward, but it stops and make some weird movement instead.

I’ve disabled all addons, reset user interface with no change. I can still not move forward with this. It also affect mousebutton right side when I’m trying to control the camera as well. Makes it really hard to play the game. I’ve played since vanilla and not experienced such a problem before. I’m not sure if a keybinding stops it, but I usually go clean on keybinds.

It do somehow affect steering with camera when I use “W” to move as well, Mousebutton Right side will be ignored and I can’t steer in that way either.

I’ve heard several other players had the same problem, but can’t confirm if it’s the same problem.