I have the same thing, I noticed a very interesting feature that if the survivors do nothing and remain at the base, then after a while, many of the survivors become ghosts or multiply making their twins. If they are ghosts, then everything is very bad and they can not be returned. They just leave the top nicks and their conversations when you give them commands. After re-entering the game, they completely disappear. And out of 6 survivors 2-3 survivors remain. And if you take them with you then there are 2 options, either they die in crowds of zombies, or they get lost without listening to my commands. They go to look for food, I command them so that they would follow me, but they still go where they went, while they say (well) to my team.

Either they spawn on objects or get stuck on them and can no longer walk. Also, when you give them a command to defend or stand, they all really want to stand on one point where I stood. If you leave them after this command and come back, they will merge into one and one or several survivors will be buried in the ground. And then they will be talking to me from hell.

But the developer apparently didn’t care for it, although he did not want to play for his bagged fashion, because he was already tired of constantly creating a new world.