Champion Grades

I'm not completely sure if this is a bug or not but I'd like to put it out there just in case it is. For the champion's highest season grade, as of right now after receiving a response from Broporo, the permanent registered grade that sticks with it is the one you received the chest for. It doesn't really fit the description of "season's highest" grade. I became aware of this yesterday where I received a S+ on Sona that didn't override the original S- which got me the champion chest.