Most of the buildings labeled "Colony" in the editor have some problems in the 3D preview window and the 2D editor. When selecting the buildings in the list, the 3D preview that comes up shows doors, canopies, canopy poles and some lights, but that's it. The walls and roof are gone. When you place one on a map, all you get is the movement and rotation node. The top-down geometry doesn't appear like most buildings. However when you hit preview and look at the things in-game they appear normal.
Oh yeah, that issue irritated the ----- out of me when I was making Diplomacy in the Gamma Quadrant. Most of the buildings used for the surface of Zelatta have this issue. It's just the preview/minimap though. The buildings look fine in the actual mission.