[.802][Bug] - Some buildings will not stay where they are put

I've noticed that after some play, some buildings hop almost all the way out of the grid square where they were placed. they can be demolished and rebuilt correctly. I do not know what causes this and have not been able to reproduce it, but it happens quite a bit.

http://dl.dropbox.com/u/8020459/Elemental%202010-06-11%2023-36-46-30.bmp

http://dl.dropbox.com/u/8020459/Elemental%202010-06-11%2023-38-07-58.bmp

http://dl.dropbox.com/u/8020459/Elemental%202010-06-11%2023-38-34-52.bmp

all 3 instances of this seen in the screenshots were the "house" city improvement, on the particular map i was playing on, all 3 were located in the same city.