I dont know the specifics ... but for a quick answer to get you started it has to do with the way the tiles lay on top of each other. Tiles laid down FIRST will show up on tiles that laid down following them. Meaning if you lay down a tile on the floor of a house, the first tile there (part of the house) will rise up over the top of it. Or something to that effect.
I would recommend a search on this, I am sure this has been addressed before.
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