If so, it's a problem with whomever did the airport work. If it's not an add on airport, then you can blame Umberto.

Not really.
Even default airports doesn't have parking tee correctly set, GSX will always try to park in ONE position, which is: placing the center of the airplane (the red cross you see in the Top Down view) in the center of the parking as defined by the AFCAD.
It CAN customized, and very precisely, but the scenery has to be made for this.