Txurce
Deity
The script does a few smart things, but it is hard to tweak, about civs placement.
It first looks at how many land masses it needs to place every player over a suitable start. Then, it distributes the settlers upon the fertility remaining in each land mass. Left on its own, each settler had roughly the same area as the others, which ended up with one or two civs starting together in an isolated small continent.
It looks like you had a huge continent in your game, able to host all players. This should be rare. (Or I didn't understand properly how it works).
What worries me is that I've been on a continent with at least five other civs on every map but one. I don't think I've ever had a run that long. It could be coincidence, but more likely something changed that had an unintended effect here.