the problem is: if you look at the pictures carefully, the value should reach the lowest and highest maximum number: 0 and 4096.
it does when I move the joystick in the beginning, just after calibrating,
but after just a few moves, the lowest and highest value start to diminish for some unknown reason.
If I unplug and replug the usb or restart, then calibrating it, it is good again, but after I move the stick some more, then the value start to diminish again.