Villagers despawn in peacefull mode

I created a world and  found a village and made it my home I build a house in the outskirts of the village and i had like 15 irongolems spawning but then suddenly my villagers dissapeared from one night to the next even if it was on peacefull. I also have turtle farm and the eggs are not hattching even though they were but the turtles keep despawing aswell....I made a new world and found a village and the same thing happened to the villgers they all despawned.... Is ther something wrong with the spawn rate? even if I cure zombie villagers they despawn aswell....