Weird villagers' behaviour

Seed "Joker_vD" (without quotes), coordinates x: 1680, y: 67, z: -2800. There is a village, and villagers behave quite strangely: most of them (like, 10 or so) are trying to fit in a 2x3 house; also, sometimes some of them drop this idea, but after some time they pick it up again—so they run to the house with abnormaly high speed (apx. the speed from the Speed II effect).

That's freaking me out, and the noise of the door being constantly open/closed is hellish.