Then GSX is using another AFCAD File, most of the time, they are dummy AI AFCAD like for Ultimate Traffic or Tools like that.
Open GSX and try to figure out, wich AFCAD it is using.
There is also another post with a similar problem somwhere here in the forum, I think they had a solution for it. But most of the time, it's coming from old or other afcad for the same airport, that have to be deleted.