P3D v4 Jetway wheels floating in the air when undocking


I'm working on a jetway for a 3rd party which docks fine with the aircraft. When undocking the jetway extends the legs and raises, but the wheels float in the air. They come closer to the ground as the jetway backs off.

This is only happening at two out of six gates of the airport I'm working on and only when retracting. The jetway model works OK at the other gates.

Thank you in advance,
Is this a normal Ctrl-J jetway? From memory, there is a bug which causes this issue, and I'm not sure that it was ever fixed. This was one of the reasons I switched to SODE jetways.