[CLIENT] maokai grade stays

Hello, i recently played a game with maokai and got an S- game grade, i noticed i didnt get any chest for the S- grade, Even though i can still earn 1 more chest , afterwards i looked in the stats window and saw my current best grade for this season is A-. please look into this issue, thank you.

i added the photos onto the link tab but even so heres the link for them:

https://imageshack.com/a/img923/8894/d96zLM.png https://imageshack.com/a/img924/727/5DbhVy.png