Always the way , we have 12 boxes in one of our main coops and the hens line up waiting for one box. Sometimes I can hear the commotion from the farmhouse, one of the girls screams like a banshee .
If you are going to let any of them brood, provided they are fertile eggs, it is best to block the hen that is sitting off from the others. Otherwise they will continue to climb in and lay behind her and then you will have eggs at various stages of development , otherwise known as a ' staggered hatch ' and that rarely ends well .