I've checked and, it's all normal, it's not a scenery problem or a GSX problem. There are no "ghosts", what you are seeing are just labels related to objects that are seen correctly, both the scenery Docking systems and the GSX vehicles, the labels are placed on ground, so they seem to be related to invisible objects, but they aren't.
It's just a P3D bug, that shows aircraft labels even for objects programmatically created with Simconnect, even if they are not of the aircraft type. You would think if the setting says "Aircraft labels", non-aircraft objects shouldn't be displayed, and of course this is how FSX behaves. P3D displays labels for every object, even if it's a ground object.
We reported this bug to LM a while ago, can only hope they'll fix it in the next version. In the meantime, you can simply disable the Display Aircraft Labels options in the Traffic settings.