I would make sure your nest are appealing and look safe. Photos of them can help to see if there's a problem. Make sure they are darkened and other are some ceramic eggs in some of them. Change the bedding often too as mites can build up in them, I will dust my boxes with lice powder every few months.
Chickens, muscovy ducks, turkeys, donkeys , goats, dogs, bunnies, fish, parakeets, a parrot, and a cat.