My mlb at bat app blacks out the wrong games, I need help please.

My mlb at bat app blacks out atl braves games no matter where they are playing, but doesn't black out the teams in my area. Anyone have any suggestions, it only does that when I'm connected to att network. When I'm on wifi I get braves games and the local games get blacked out like they are suppose too. I've contacted MLB and they say their end is good. Thanks!