When a Supply box is placed in zeus, the bounding box/physical size of the box is huge. It extends about 10 meters (or more) above the actually small box at the bottom of the mass. As a result, the box is *extremely* unstable, as most of the mass is high above the actual box. As a result, the box often falls over, and the handle for selecting the box flies underground (as it is attached to the top of the mass).

I am not sure whether this issue applies just to Zeus-placed boxes, or to all supply boxes.