Oh, I meant that the aiming was mis-aligned. For example, the bullets would shoot at a spot that was about an inch (on my screen) lower than the mouse cursor. And when the mouse was close to the player, it was more apparent that the aim was pointed at some weird offset from the where the actual mouse was.
For example, if I put the mouse cursor directly above the player, the gun would aim up at a diagonal about 45 degrees. The aim is just a little bit "off" but I was able to sort of get used to it by ignoring where my mouse was on the screen.