Last Known Position Keeps changing!

I an a newbie so I am wondering why “Last Known Position” on My ADS-B keeps changing even though the receiver (Raspberry Pi) is in a fixed location at home. I change it to the correct location, and within a few hours it has moved me out in to Ohio again! Any way to make this stay where I put it??

I think this is a bug as per this post: ads-b-flight-tracking-f21/nearest-airport-and-location-off-t19443.html