Player Profile Background Bugged?

My current player profile has not changed since I have moved to the new client back in late January. It has always been Morgana. Problem, I have not played Morgana in months. Is there something that is preventing my player profile from changing to some other champion? From what I understand is that it is based off of your most frequently played champion. If this is the case then it should be Nautilus or Caitlyn for me not Morgana.

*I now see my profile says it will display my highest mastery. How come this is just on my profile but all my friends it is most frequently played.