Mu ? What is that stat ? It' would be more intuitive if we could link the stat shown in your post (1800+) to the number we actually see in our profil, rather than a hidden stat we can't see. It's not very important, but i bet i won't be the last to be confused by it ^^
You could just rename your categories. If 1800 Mu = 1600 real rating just rename 1800+ into 1600+ ?