I've seen this issue come up multiple times with most FSDT sceneries, and yet still no fix. I've seen a lot of this umberto guy saying "it's no my fault/problem, probably an AFCAD file" and still no fixes.
And your mistake is exactly that. Instead of TRUSTING what I've said, because it's obviously the truth, you are so convinced it's something we should fix, so you are still with the problem, because you are not even trying for a moment to believe what I've said, and act on it. Do you REALLY think we would sell the scenery ( with a Trial... ) with an inherent conflict ?
This has been explained so many times on the forum, each time you see anything that "looks default" mixed with an add-on airport you bought:
- IT'S NEVER A PROBLEM OF THE ADD-ON AIRPORT YOU BOUGHT
- IT'S ALWAYS A PROBLEM OF ANOTHER SCENERY IN CONFLICT
As explained so many times too, the most common case of conflicts are caused by AFCAD files coming with AI Traffic product that are supposed to "Enhance" the default scenery but, if you have an add-on
airport, they almost invariably caused conflicts and double objects, so they should be removed.
You can use the free Simple Airport Scanner utility to search for duplicates AFCAD:
http://www.scruffyduck.org/simple-airport-scanner/4584282795Or check the name of the AFCAD used by GSX in the parking customization page, this might give you an hint of which scenery is the conflicting one.