Tile Hero: Not Rewarding Powerups

I have completed at least five chapters and not received the end of chapter reward power-ups. The game graphics appear to be awarding the power ups, but when opening the next screen to play the power-ups are nowhere to be found. I did not have this problem when the game first became available. I enjoy the game and have continued to play in spite of being short-changed the power ups, but it's getting frustrating to earn something and not receive it. Anyone else have the same issue? And if so, how was it resolved (if, indeed, it was)?