It happens to me too. When I open my game, skeletons were on the centre of the village and I had to quit the game. When I returned, my villagers were caring skeletons just under the coconuts tree! I have read that they could be... in the ocean

I think it's the same phenomenon that when you find kids in the ocean, in the pond or a villager on the roof of a hut! I like this glitch!
