Interesting, I have found another bug in that case, I get no such option to calibrate from within the GUI, rather I just get a 'reset calibration' button which just clears all assignments in my case, the only other options I get are for deadzone an linearity which I keep at 0 and linear respectively, the GUI still only lists 3 instances of HID with no specific identification of each device, all 3 have the same options.