Im having the same problem. My 4 girls have shared 2 nesting boxes for almost 2 years. No problems. But...I added 2 hens who are just starting to lay and now I'm finding eggs everywhere but mostly on the ground. This morning I found 2 on the ground in totally separate places and 2 in one nest. My Delaware white laid her first egg yesterday and she was in the nest next to the 2 eggs. Not wanting to disturb her I left the 2 eggs where they were. When I went back a bit later to collect them, I saw her out of the nest, one egg of the 2 was broken. But I did get her 2nd tiny egg from the other nest.! She is so big she barely fits in that nest!
Does anyone recommended a particular brand or style of nesting boxes? I figured adding 3 would be smart. Then I need to figure out where to put them.