What size map were you playing on, and with how many other races?

I've had something like this happen, too. Sometimes, when I start a game as a custom race, it seems to start me in a randomly generated system instead of the home system I'm supposed to have. My homeworld has an initial colony and 2 billion people, instead of the civilization capital and 8 billion it's supposed to have. The homeworld is named what I chose, but the star is called "Custom Star". The home planet is always PQ 10, sometimes it needs a colonization tech, and there are always 5 planets in the system, some habitable, some not, and some needing colonization techs. This only seems to happen on the smaller galaxy sizes. And it happens even if I make the custom race a modded home system in the CustomPlanets.xml file.