I'm having the same problem. When I'm using my 1360x768 monitor it does not pan to the left, when I'm using my 1920x1080 monitor everything works fine.(WASD keys work fine on both monitors). I've increased, decreased my mouse sensitivity through windows and my mouse software. I tried full screen, windowed, windowed borderless mode still doesn't work. I've even made sure to test each monitor by itself to make sure that having two monitors connected at the same time was not the root of this problem (it wasn't). I'm going to go out on a limb and say that it is probably a resolution problem.