There are two monsters named Lizardman Priest (one has a 14 card deck and the other has 15) currently in the game, using basically the same model - but one of them seems to be an unnamed Slub'Gut (model is named, not deck like most named mobs are) - while the other occurs in several adventures.
Thus far all "decks" have had a unique type or name - this is the first that looks like it has the same "name" for two decks (with varying size). Maybe not a "bug", but mob deck should probably be named Slub'Gut rather than Lizardman Cleric? Compare to Pokkin et c.