Towards the late game after I've been invading other races I have several copies of each super project . For the most part it is not too noticable when it is manufacturing capital or the political capital. However Hyperion logistics upgrade and Hyperion range upgrade stack as well. At the end of my last game on Huge I had 68 logistics points and could go anywhere on the map. Having extra 18 - 24 logistic points really changes the balance of power.
Is stacking of super projects an intended effect?
Oh and I had that bug with 454454543b population after invasion show up 3 times in that game. The ridiculous population dissapears after 1 turn but the planet is still maxed out in pop. Meaning after invasion that planet went from 1.2b to 23b (max population based on farms). Since that is a documented issue I wont be submitting it to bug forum. But I really want to know about those super projects