I downloaded a number of modded civs and made sure that they all have YnAEMP support, but when I go to customize game (how you normally set up a game with YnAEMP), only some of them are selectable, such as Chinook, Xia, Mali, and Louis XIV's France. While some of them are missing, such as Hitler's Germany, Zaire, Taiwan, and Sibir Khanate.
The weirdest thing is, if I start a normal game, they are all there, but in a custom game many are missing. I saw some other people having the same problem but no one really provided an answer, I really hope that I can get help this time.