Looks as though it's registering a leftwards control input. It might be an issue with a joystick that's not got its deadzones configured right (if you have a joystick), or it's a trim issue. If you hold alt+(w,a,s,d) it moves the zeroed position of that control, giving you a certain amount of trim. To fix that, hold alt+(opposite direction) until the control indicator in the bottom left sits on the zero marker.
Did you remember to click the coathanger next to their names, as in Boyster's screenshot? Failing that, I'm not sure what the issue could be. I haven't got Breaking Ground yet, so can't really help beyond that.
CommanderSmith's post in Yaw automaticly moves to left was marked as the answer