There's no "problem" at all. The gates at KORD and KJFK are intentionally labeled as such, in order to get rid of the default ground service vehicles, which other than being all the same at all airports, are quite fps hungry so, we replaced with our own.
But, this is not the reason why you don't see traffic, there must be something else because, even if a parking spot is labeled as GA, as long the size can accept the airplane and as long the airplane and the parking have an airline tag (and both our parking and WoAI planes have them), the AI will be able to park at the correct places.
We, and many other users (there was even a screenshot posted today about JFK with WoAI planes) normally use JFK with WoAI so, the fact you don't see any traffic doesn't depend on the scenery. Check you don't have multiple traffic bgls, for example. Or, you don't have duplicate AFCADs-