I noticed that each of my planets has a HUGE stacking bonus for Iridium World -- rather it has the improvement or not.
Rather then give the specific planet it's on a percentage bonus to Influence, it appears to be giving the whole civ a stacking bonus to influence growth. My tooltip says "Iridium World 540% (14)", which as you can imagine is pretty damned strong.
Is this a bug or is this working as intended? Has anyone else experienced this?