Steve ... try this. Go to your folder for your sim and put in the airport icao and do a search in that folder for the airport. Whatever is affecting it will show up in that list. You may have a MyTraffic file or something 3rd party that is affecting it, this will help you find it. When you see a "double" ... then choose one to turn "off" (change .bgl to .off). And that might solve the problem.
Hawaii is particularly confusing in this aspect. There are several airport scenery programs that can affect it. If you have the FTX Airports (from OBBX), when you "update" them, they'll put those airports you've taken out right back in there as a "hot" bgl. So anytime that updates from FTX Central, I have to go in and turn all those hawaiian airports to "off" again. (I've made a list that helps me do it quickly). But here again, I search for that ICAO, it will come up, and I can change it right there to "off." This is also why I haven't made any scenery changes around any of the Hawaiian airports, there is enough activity there to drive us all nuts without me adding another layer.