I managed to build two starbases on top of each other on one resource. Has anyboby else succeeded in this? I have no idea how I did that, so I don't know if it's reproducable. Noticed this when I clicked on a starbase which I had upgraded a couple of times and info didn't show any extra modules. When examining this closer I saw that there is actually two starbases in one place. I have a save game showing this if needed.