This is the second time this problem has occurred. During a game, after encountering all the civilizations, I suddenly "rediscover" a civilization of the same race as another one. As you can see in the screenshots, a new civilization of the same species as another one has appeared. And in the stats, it seems that this one was created out of nowhere. Is this normal?

Screenshot1 : The same race appear twice : https://ibb.co/CVxVjX9

Screenshot 2 : The new race starts the game from nowhere : https://ibb.co/VHgdzRX

Thanks