I have 3 hens and they all want to lay their eggs in the same nesting box, at the same time. Every morning, my 3 hens fight over the same nesting box. They holler and squack, and kick each other out. Why, we have 3 nesting boxes one for each of them, but they all seem to want to lay just in 1 box. What can I do to get them to lay in one of the other boxes? And does anybody else have this problem?