Playing from iPad 2
On normal difficulty
On successful completion of questing with a level 3 dwarf archer and level 9 assassin chick, cleric chick, Mage chick, the black crusader, and beast girl.
I am able to select any of the rewards available for leveling my new archer up to 3, then whichever character I pick next to receive their card reward ( level 8-9) the card flies up on the screen and is uninteractable. Also the front card reward I had received for the archer disappears and leaves behind its pulsing background animation.