I have a profile that I'm on level 63 on and took me a very long time to get there because i had to play on adept the whole time. Now its getting a little too easy now so I wanna switch it to expert. But I wont let me. When I go into the settings screen I go to difficulty and switch to expert then exit the screen. When I pull the screen back up its on adept again. (I play on 360)