This is something that we have never seen before nor have I seen anyone report behavior like this before.
Is it something that is happening on every flight? Are you sure that there are no key bindings that you are for example using for camera add-on that might be also bound on the rudder.
If you can recreate it, could you maybe take it on video what is happening. Preferably with F/CTL page and the rudders showing as well in the cockpit (zooming out enough)
First of all sorry for the late reply.
This is interesting as it looks very similar to an issue that we have been trying to hunt down for a long time with no success. Are you able to recreate this? I will try it also myself to see if this gives us a clue on this issue.
I know it has been some time since you reported but if it's at all possible to give some more details about the flight like the route, that would be greatly appreciated.