Villagers will not restock

I've recently made a villager trading hall and after trading with the villagers for a while, they needed to restock. However, the villager would not restock at all, even though the profession stand was directly in front of them. I have waited 6 in-game days and they have still not restocked, also the profession stand has been acting really strangely and the villager would not always get the profession when i placed the stand near them.