Well, it's not a problem.They are not part of the official format, they have been done by amateurs. According to Warfather's timeline neither Brad nor FFG tested the cards. It's 36 cool cards for the champions so they have this little "extra" thing to play with their friends, and it's a cool reward for a champion.
What's frustrating about it is that the initial prize was for the cards to released as part of a future expansion, hence implying that it would be extensively tested in a manner similar to the other officially released cards. Thanks to the game ending they rushed them out before GW's deadline, hence why some of the cards are either missing text or have unnecessary text.