Interesting, I do feel the the software readjusts your CP to try to be more accurate as you are placing more sometimes.
Also sometimes like you said I will get a HUGE error for the CP when there is no error. Normally this goes away on its own when I try to do a realignment. Clear/Reset suggested points…
Honestly, I dont remember what caused it and how I got rid of it exactly. But I do remember this slight bug.
Also, why did you start calling your CP’s PP? Ground control? I still am not sure how ground control works…