Client Bug With Mastery Tokens

Got a S- with my main champion and it said at the end of the game I received a mastery token. I went to check my loot and crafting inventory to see if I could upgrade to mastery level 6 since I have received 2 mastery tokens but, when I went into the loot and crafting inventory I had no mastery tokens at all. Please fix so I can get my mastery level 6.