Today I discovered something like this.
In the extended tune settings of Mission Planner
I tried to set Stab Yaw kP.
For example, if you set Min as 1 and Max as 8, and set 6ch to max then write, the Stab Yaw kP was set to 0.008.
So, when I set Min to 1000 and Max to 8000, it was set to 8.
And for Rate Yaw kP, it was set as 1 only.
Update Mission Planner to latest Beta from the Help screen.
Unfortunately, I tried with beta MissionPlanner,
It was same.
I’ll check again.
I didn’t have a problem with that same configuration but you can always use the Full Parameter list to set the parameters.