I also noticed that some if not all of the 285 maps dont appear in the stats as well as all the aa3 maps -
(maybe thats why not so many people bother playing them)
Is there a way to change this ? (battletracker)
Well the problem with the maps is the fact that since they were not originally part of 2.5, their names are now [285] Mapname instead of just the Mapname it was in 2.8.5. Now since the names differ, battletracker isn't tracking them fully.
As for 'fixing' it, yes, you're right, it's to do with Battletracker.
Unfortunately, though, battletracker admin (Homey) is very inactive and has been for a couple of years I guess.
And since he's the only one who could do such things, there's not much that we here can do.
Bare in mind, he was sent a PM asking him if it would be possible for him to do it, but there was (to my knowledge) no answer.