Track Log Question?

I’m more curious than anything, but I have noticed that FA decides to end the flight early. Below you can see my ADS-B is still picking the aircraft up 200ft lower. Why does the track log do that? Once again, I could care less, it’s more curiosity. This isn’t the first time this has happened.

My Radarcape picks up flights on the ground where as my FF box does not report any flights below 700 ft. I think this is inherent to dump1090 and should be configurable. However, on the FA’s server end, they may still be filtering at a minimum threshold.

dump1090 (at least dump1090-mutability - I can’t remember the exact set of bugs I fixed versus stock) is fine with low / surface positions (I regularly pick up aircraft landing at Cambridge)