Sunken AI parked at gates

[MistyBlue]

Hi all, I often some AI aircraft parked at gates which are sunken into the ground (just the tails sticking out of the ground).  I'm running latest versions of and  PSXT, RealTraffic, and P3D (v5 and v6) with AIG models.  Specifically this is happening at Flightbeam's KSFO but I haven't tried other airports to confirm if it's happening elsewhere.

Any advice on what I may be doing wrong in my setup?  Anything I should look for that could be creating what I would assume are airport elevation conflicts?

Many thanks!

[kiek]

Try other airports first I'd say.