HELP! Map loading error!

My problem is with my Halo Reach game. My problem is when I try to load a map I forged, it will instead load Solitary map from the anniversary map pack. Ive had this problem before with other maps but the problem usually fixed itself… But it has now been 3 weeks and it’s still hasn’t corrected itself. Ive tried everything from loading a different map then trying to reload the map I want to deleting the anniversary map pack and then redownloading it. Nothing has worked.