Clerics' trade cool-downs will not go away

Villagers with the 'Cleric' profession will not let me trade them after an amount of trades. I have waited more than an in-game week and the cool-down for their trades will not go away. This bug seems to be exclusive to clerics. The other villagers' trade cool-downs go away after some time. I have a lot of gold ingots ready to be traded but all four of my village's clerics won't let me trade them.