http://postimg.org/image/fp4fw89wb/ As you can see in this image my 1st level dwarf warrior (the one who came with the multiplayer pack) appears to have Wavering Faith, Minor Heal, and other cards he shouldn't have mixed in with his cards. These go away when you add a character to the party, so it's not an issue of them somehow being given these cards it's just a weird graphics issue. It appeared on the elf wizard before him and on every character after him but not on my original characters. I've unequipped all of my original characters items so it's not bleeding through from their sheets. Leaving the Keep on the Hinterlands and returning did not fix the issue.
I saw that today too, when I recruited a new character. When you change characters, it's drawing the new deck without erasing the old one, so if the new char is low level their deck won't fill the whole area and the old char's cards will show through.
http://www.cardhunter.com/forum/threads/new-recruits-and-party-bug.577/#post-6907 Highlighted almost 6 mths back, it goes away when you've unlocked all the slots. Hope it helps.