The scenery AFCAD clearly has a bug in that area. Most likely the nodes close to the parking are wrong/missing/overlapping, etc.
You might be able to fix it in GSX with the scenery customization page, inserting the Lat/Long coordinates for a custom Pushback node (which is a node that must be already existing in the AFCAD, though), but it would be best if you report this problem to the scenery developers, since they might want to know about a bug in the AFCAD.