Sims 4: Certain Chickens Wont Go in Coop?

Only one of the chickens will go inside the coop, but all of the others say it's unavailable. I moved the coop to a wide open area and they still can't get inside, I try calling them all into it and they can't go, and I click on the animals individually but it says the same thing. I feel bad, it keeps raining in my game and the poor chicks have to sleep outside in it lol.