Collection - Masteries

Hello and thank you. Is this a bug?

After leveling up Blitzcrank's Mastery score (with blue essence) from level 5 to 6, the champion **disappeared **from the "loot" section.

Restared PC, restarted client, one day is gone and it still doesn't show Blitzcrank on my Loot.

I can't see or combine tokens to level up again.

Fix this please! Thank you