Villagers making bad decisions

The vilage had bad house all them do exept a mansion by villagers too

But they share mansion

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But they are choosing the ugly houses instead of the good houses thats the bug

I hope this is not some sort of trolling attempt.

If not:

I'm not sure what you're trying to do with the villagers - building a bigger village perhaps?

In any case, a villager requires two things to function, namely 1. a vacant bed and 2. a job site (that determines his profession, eg. a brewing stand is a cleric's site, a cauldron that of a leatherworker, etc.)

If there are vacant beds and the villagers have sufficient food, they will breed to fill the beds.

As for aesthetics, the concept doesn't apply.  You can literally make a barn lit by torches containing spaced beds on the one side and job sites on the other and they will happily fill that provided you give them enough food.

By the way, there is a wiki for the game Minecraft Wiki which has information regarding game concepts such as the above which you may find of use.

Thanks some big houses spawned but they all go in 3 by 3 small house

Haha, villagers go into any house they are bots not players, however villagers can crowd up into 1 house and things like this, is anything like this happening or is it just the houses are small