There is a block of land in my res bob_keep that within the past few hours has shifted down about 25 blocks. It is in my zoo, and have put fencing up to keep horses from falling in. The block ranges from 751, -336 to 736, -321. I will check the rest of the area to see if there are more.
Update: The land was not pushed down, but replaced with part of my village, which is at a lower elevation.