Two wierd things happened.
My minecraft went through one of its ritual freezes, and I closed and reopened it. However, when I reappeared, about 10 zombies had spawned randomly around me in the village. After a couple of minutes they were all dead, but there were also a few close encounters with creepers. No skeletons or spiders spawned inside the village.
Secondly, all my villagers, when the day came, all went to one house; one of the smallest ones. There are about 17 or 18 of them all inside or on the building. Sometimes they fall off the top.
I don't know what is going on.