land is couple seconds reseted to delfault when i enter server

[Morncoth]

i have asked this same question also to my server renting client and they sayed that is game bug so i come asking here now.

so..when i entering my world, it seems land is reseted to delfault couple seconds what was it before diging there. all other stuff is normal.like buildings..problem is that all our animals are they stables roofs after land rendered right. anyone can help?