Let me make sure I understand where you see these extra aliens appearing. 1. In the character pool? 2. In the barracks (under the armory menu)? 3. The project, rather than the alien itself, in the proving ground menu? For #1, I don't even know how aliens could get there. I have never seen any aliens there let alone any extra ones. For #2, the only time aliens appear directly in the barracks is in the very first version of the mod by sgtcal. All the versions since March have aliens appear only when you complete the project. I suppose it is possible you have a save game which includes that old version of the mod, and perhaps that is acting as some kind of infinite loop generator. I don't know how to get rid of that. For #3, this is reported commonly, and may have to do with a relatively recent mod version overlapping with the latest mod version, when you have a save game with one of them and you load it with the other one. Sometime in March it was reported that the way the game tells mods about whether the mod is already loaded, does not in fact work. So the mod may not realize the mod is already in a save game, and may add the projects over again.