I just saw a bug with dual Hero cards in two different games.
In the first game, my opponent, playing as a Shaman, played Jim Raynor. However, when the card was played, the class color on the card was displayed as Paladin.
In the next game, my opponent was a Priest and played Artanis. This time, the class color on the card was displayed as Druid.
This is a current bug.