I keep having the same issue! When a hen goes broody in the 'favorite' nesting box, the other girls lay their eggs in there when she goes to eat and potty. Last year, I had a hen sitting on over 40!!! eggs before I realized what was going on. I let her hatch a few, then brought the rest in for the incubator. I see the same thing happening again. I took 6 eggs from a broody hen today alone, then booted her out of the nesting box! They have 2 favorite nests and 6 others aren't being used!!! I moved her and an egg to an empty box, but she fussed me out and walked of...not wanting anything to do with my idea! How do I correct this???