Mastery 7 bug

Hello. Here is some information about Mastery 6 through 7

CHAMPION MASTERY LEVELS 6 & 7 Earning an S- or above on champions with level 5 mastery will net you Mastery tokens. Combine these Mastery tokens with Hextech loot in your Hextech Inventory to reach Mastery levels 6 & 7! Here are the details for each rank:

• Earn Mastery 6 tokens for S-, S, and S+ games with champions that are Mastery Level 5. Combine two Mastery 6 tokens with that champion's Hextech shard, permanent, or 500 champion essence to unlock Mastery Level 6.

• Earn Mastery 7 tokens for S and S+ games with champions that are Mastery Level 6. Combine three Mastery 7 tokens with that champion's Hextech shard, permanent, or 600 champion essence to unlock Mastery Level 7.

Mastery tokens, champion shards, and champion permanents used in unlocking Mastery must all be champion-specific, so if you want to hit Mastery Level 6 with Quinn, you'll need to earn Mastery 6 tokens by hitting S rank with her.

You can only earn Mastery 6 and 7 tokens in Summoner's Rift normal and ranked games.

Taken from Champion Mastery Guide Some of the information is out of date but the last sentence says you can only earn Mastery 6 and 7 tokens from Summoner's Rift normal and ranked games.