Cursor stray during gameplay

[snowboundleaf]

I am having an issue with my mouse exiting game window while playing.

For instance, when I turn left in game it moves the cursor left. If turn left too many times it moves my cursor off the screen and if I click it selects out of the game.

This happens in all three view options, and I've disabled background programs as well. I'm lost as to what else I can do besides just not turning left