Simucube 2 sport problem

I fix 900 degrees in the simucube panel but when I calibrate it in iracing calibration option page (drive page) I obtain 850 degrees.
What the problem could relate to be?

You turn something else than 90 degrees in iRacing calibration wizard.

Too intrusive bumpstops, maybe? Did you reach 0 and 656xx values when calibrating to both sides?