Prevent mulitible human factions from spawning?

[ByLeven]

I play with a custom human faction, and it really bugs me how I usually meet other human civs scattered across the the galaxy. Totally breaks the immersion. Is there a way to prevent the two human presets from spawning? A mod or something?

If I could only get rid of those mushroom civs too, would be perfect. Just dumb that they are included.

 

[ByLeven]

Never mind... I think perhaps a mod might be causing this issue, when I think about it...

 

[The Founder]

The two human stock factions (UNS and CoM) have a Flag to be identified, "Human_1" and "Human_2".
If you modify them to start a game, that tag will persist. However if you save the empire that flag will not persist.

If you got Human_2 flag, the special story will happen and there is a chance for the UNS to exist. The UNS Humans will copy the CoM derivates species traits.
If you got Human_1 flag, no other human faction will spawn (especially not the CoM).
Of course any of the empires you derived from humans and saved may still spawn, as typical for any custom empire.