Villagers have wrong professions

When I was exploring the world in snapshot 16w33a, I came across a village and wanted to trade with some villagers. But I stumbled upon a 'Butcher' with a cleric trade. I reloaded the game but it did not resolve the issue. The villager has a butcher texture along with the name but it has a cleric trade (e.g. Rotten flesh for emeralds).