Snigs my man!
Almost certainly your joystick setup.
I have found that it can catch you out. You must calibrate that particular device with utmost care. When you think you got it right run the test and watch for any faults.
If NONE go back and do it again. Then and only then set it up in FS2000, with each individual component as you want it.
It's a tricky device this one, and the drivers were very iffy. But calibration IS where it all starts mate.
IFR