My RIR hens have been laying for 4 or 5 weeks now with no problem. I have had only three jelly eggs with 12 hens and figured all was going well. One day last week I got two eggs on the coop floor instead of in the nest boxes. I didn't think much about it at the time but for the past two days one of my hens has dropped her egg on the floor and cracked it. I have 8 nest boxes but there are two or three in particular they all prefer. My question is why would one of my hens suddenly start using the floor instead of her nest? The only thing I have done in the past week that could have played a part in this was to change out the shavings in the nest boxes. I used golf balls in the beginning to encourage nest usage but have since removed them From the looks of the cracked eggs the hen may be sitting on the roost in front of the nest and dropping her egg then. Any ideas or suggestions?