Hi,
Cheetah3D has a transformation hirarchy. Lets assume you have a folder which was moved to the position (1,1,1) and a polygon object which was moved to (2,2,2).
If you now drag and drop the polyobj into the folder the polyobj will be moved (2,2,2) relative to the folders coordiante system whose center is at (1,1,1). So the polyobj actually appears in the scene at (3,3,3).
That intended behaviour probably is the reason for the move you mentioned.
By,
Martin