I don’t use it so it’s just speculation. Could it be a problem with the default keybind of Alt + C then S for save cockpit configuration and Alt + C then L to load cockpit configuration. Maybe it’s automatically loaded if you start on taxiway or in the air and when you ramp start, you have to manually load it. You might have accidentally did and Alt + C, S at some point on accident. But again, just wild speculation I really don’t know much about cockpit save and load functions.
This could solve it, although I don’t think it was the cause as its a clean install - however I did copy a couple of “callsign”.whatever files across so could be causing a few issues. I can get the jet the way I want it then Alt + C then S to fix. Thanks for this, I totally forgot this was even a thing!!