I am playing a singleplayer survival world on Xbox One.

Im making a villager breeder room filled with beds and such. Villagers are not sleeping correctly on beds and whenever they try to sleep, most of them become invisible. Sometimes when they wake up, they are still in the sleeping animation and fly around. Some have also been seen going through walls. I've never seen this happen before. When I save & quit and load back, they are all there again.
This has been happening for a fre hours and isnt a real issue, juat confusing. My phone wont let me add pictures, apologies :]