almost every world I create has some kind of error affecting world generation it seems that while generating chunks minecraft forgets what was generating order and starts generating new one not related to it`s surroundings
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Are you deleting world and creating new ones with the same name as the old ones? Try starting a world with a unique name.
Yes, infact the seed was "gimmeabreak".
I have this issue since 1.4 update.
look here for more detailed look on this
http://www.youtube.com/watch?v=hDX0jl-g3oA
Create world with the same seed twice. Do you get the same error both times?