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What I'm saying is the map is part of the standard edition of bf3 (which i have + back to karkland), but when trying to load it from your server it asks for the aftermath expansion when its not even included in that. I tested it and i could join other servers running that map, but your server makes it think its part of the expansion.
I think that is the conclusion i drove too was like you said, if the the servers are running DLC maps in the mix then it requires you to have expansion regardless of map being played.I was under the impression that you couldn't join a server if it had any DLC maps on the rotation (if you don't have said DLC) regardless of what the current map is.
I am suprised you could enter these other servers. Were any of these other servers you could join actually live? It might be that you could join them when they are still in unranked/warmup mode (less than 4 players), but once it goes live you would get booted. Just a theory.