[neofit]

Don't know if it's a SEV, a 1.13 or a Balance Mod 0.96 bug, but the migration figures seem a bit odd.

I play the humans, rock/oxygen, and have a migration clause with the methane-breating Xi'Chung. I colonize a methane planet, in a new sector that is 4 warps away from the nearest Xi'Chung colony or my only other planet that has Xi'Chung immigrants.

Turn 1: colonization takes place, 25M humans come down from the colonizer (5% migration/year, 10% birthrate/year)

Turn 2: 27M humans (5% migration/year, 10% birthrate/year) + 181M Xi'Chung (5% migration/year, 12% birthrate/year)

Turn 3: 29M humans (5% migration/year, 10% birthrate/year) + 366M Xi'Chung (5% migration/year, 15% birthrate/year)

So, first, for the humans, the migration and birthrates seem to be calculated per turn and not per year.

And secondly, where do all these Xi'Chung come from? Even if migration does not take proximity and cargo ship carrying capacity into account (my best freighters can carry about 30M people, and I generate twice as many research points as the Xi'Chung do), we do definitely not see anything resembling a 5% migration rate. Colonized a 3rd planet, same explosive growth. I mix them with humans on a carbon dioxyde planet that is domed for both of them, and they again grow many times faster than humans.