[Bolelas]

Well, mr Devil, i donk know the joystick, so dont know what caind of sensors it uses. But it can be something forced in the sensor/pot, (or excess of use) it can also be calibration, or something in the electronics. If calibration,
try some programe to calibrate, instead of using only the windows calibration. The windows calibration "sucks". So, do it manually.
I use 2 programes, but there are more. What i use is freeware: DIview, and Dxtweak2. Just spend some minutes and sure you will understand how the programe works. You will input the nunber you want for center, and also were it starts and were it ends. Even if it doesnt help you, it is a precious tool to work with game controlers.