Don't know if this is fixed or not but I encountered a bug a while back where a faction's per pop growth did not add up to the right amount (0.3%, 0.5% and 0.2% and yet the monthly chance to gain 10% progress was 1.2%) as well as another bug where I had a massive faction with over 100 pops that only had a growth chance of about 1% per month. The only reason I didn't post about this in the bugs forum is because I no longer have the save where I got that problem and I can't remember the version or checksum so I would be unable to give the important details. I think it was pre-asimov though.