Possible bug in 1.78?

[Taz-in-Space]

I appear to have found a minor bug in 1.78

I started a game with all empires having a homeworld in a sphereworld. (Via map editing)

I gave my empire the advanced storage trait so that my maximum pop is I think 77B.

the bug came in when I changed my mind about using a colony ship (I decided to upgrade the engines first) and dumped my population in the colony ship back to the sphereworld. My population went from around 69B to 60B. I dumped 34M Colonists back and LOST 9B?
I know that this start is unusual, but how do you add population and get less as a result?
BTW I was using Deathstalkers GoldD Mod on top of 1.78 SEIV

[DirectorTsaarx]

Someone else posted about that problem a month or so ago (before the current patch)... you may want to do a quick search; I don't think the issue was resolved, so you should also send a savegame (and any modded files) to Aaron...