All animals, iron golem, villagers desapear

I was playing mcpe realm normally. I have a villager farm, iron farm, i had a sheep in my house, iron golem, many sheeps and cows, and i dont know why everuthing desapeard! So i enter in creative mode, got sheep egg and spawned many sheeps again.. in a few minutes they desapear again, and iron golem too! So everything is desapearing and i dont know why!!!! I just want to play a normal realm with my friends, help me please