There is something called electromagnetic noise or interference. Since the GPS signal is an electromagnetic wave it can be disturbed by the electricity going through your charging cable.
I think it is similar to the phenomenon that your FM radio has bad reception when you use a wall charger, which is not grounded (like I do).
Possibly. Most people active here on the forum are not FP employees because the forum is led by the community. Also the community moderators are not employed by FP, but users like you.