The rotation is a strange twisting motion, not the tilt of a velux. I suspect the window export of a snapped and rotated at import object is messing up that openable mechanism.

Most likely the export/import changed the direction of the hinge movement. It will take some experimenting but moving the "sweethome3d_hinge_1" string to a different side of the hinge part would solve that. I have encountered the same with hinges and changing the hinge side solved it.