I had a problem with the calibration too. When i switched of my kpa the calibration gets lost. It looses the last 5% of range. I opened a ticket and i have sent a picture to Burkhart. The answer was quit easy. Burhart has seen that i used a selfmade trs cable for one of my mission pedals and he recommended to change the cable to a original new one. What can i say, stupid me, i changed the cable and from this point i never had the issue.
So weirdly and ironically, one of my TRS cables that came with my Moog Pedals went bad after reading this. I had no idea those cables could be so fussy.