The ParkMe system doesn't control jetways, it only controls the Visual Docking system, and the parking evaluation. Jetways are handled by FSX and are in the AFCAD.
I've checked ALL parking stands at Terminal D, one by one, and none of them shows double jetways.
Are you using AES ? If yes, there's a fix for it which solves a problem with KLAS, that can be downloaded on Aerosoft forum.
If not, it might be a video drivers problem, since jetways are related to skinned animation, which is a graphic hardware feature, you might try updating your video drivers, and/or resetting the drivers to default settings.
