Quickshifter randomly cuts a second time after shifts

in ZX 636
Hello Guys, I tested my FT-ECU-Flash now for 4 track days and it works like a charm - except the Quickshifter. The shifter seems to randomly cut a second time after a shift. I already changed the sensor, the bearings and shifting rod on my bike, to get rid of possible failiures, but the problem still happens. I tested the same setup with a PowerCommander QS and it works without any problems. It seems to be RPM-related, it happens more frequently above 14,500 rpm. While googling the error I also found another user who has the same issue, also on a 636e. Is there a way to fix this? Greetings, Jan