First game after level up tells you that you got another capsule.

When you play the first game after a level up, the game tells you that you fullfilled a quest that gave you another capsule, but you don't actually get another capsule.

Potentially this only happens when you level up, open the capsule from the level up and then log off.

Potentially this only happens when your next game after level up has the daily win quest and you win.

I got this bug pretty consistently because I log off and don't play for the day after hitting a level up.