my survival house was in a near a mountain  biome and it had 3 chested in it and my bed and nether portal . when I logged in to Minecraft this morning the whole area around my house was completely changed and when looked at my map it was a sort of checkerd pattern in the terane. mountain range and forest pattern are the two biomes. my house and all my chests and things where sort of absorbed by the checkerd glitching biomes now all my things have gone.