World was not saved

Yesterday i recreated my world to play with "Biomes o'Plenty" mod. Pasted home from previous world and played a while, when logged out and gone to sleep. All the playing time in game chat was messages what "world is saved", so i hadn't no worries about it's safe. Today, when i join the server, i spawned in a random biome (yesterday biome was field with red flowers) with just green grass, but i have leaved server near my house. So i do not understand, is server recreated world again or it is spawned me in other random location so my house is safe?

Oh, this is sad