You sent the same question to the support email, and I already replied to you. As you can see from your screenshot, that airport has an HELIPAD inside, and to deal with this situation, GSX has a specific method to exclude the Helipad using a visibility command.
This is of course fully explained in the GSX Manual, Page 26, the "Airport Visibility" chapter that explain how to deal with "Auxiliary airports/helipads/seaplane bases"