I have 25 ladies and one gentleman that all are around 5-6 months. I now getting 12 to 18 eggs a day. The two slackers are a bit younger by about 3 weeks and are brahams. One little girl goes in and just sets on the top of the nesting boxes like she's roosting and the other just goes in and out. For the last four days I have been finding just the yolk in the nesting boxes. No white no shell. They are on Layena feed with free oyster shell. Could this be growing pains? Or could something else be going on? I don't think it's from any of the others as have no problems with any other eggs since day one. Any ideas?