So what's the deal with this Mastery bug?

https://i.gyazo.com/208b654785294688b0e3f6e9cb3d5451.png Right here it says I got an S+ in a game.

https://i.gyazo.com/1d868f2a339e1d76d6f8e063f4f2ae95.png But then in my Collection Tab when I hover over the champion, it says my Season Highest Grade is only S.

This has happened on a handful of my pocket picks that I know I've had multiple S/S+ games on.