I've researched this problem but haven't found anything exactly the same, so I'm hoping someone here might have ideas. I am new to chickens. I have 2 Americaunas & 1 Brahma. They are are 8 months old & started laying about a month ago after I put a light in the coop (it turns on about 5am). The Americaunas lay beautifully. The Brahma is having problems. 4 out of 5 of her eggs have no shell (thin, leathery shell) & she tends to lay them during the night over the dropping tray. Twice in the past week she's laid 2 eggs at a time (with no shell) . Every now and then she'll lay an egg with a shell in the nesting box. Half of those (good) eggs are VERY small and half of them are double yolk & giant. All chickens are eating laying feed & I sprinkle oyster shell liberally on the ground & well as have a bowl of it in the coop. Is this a genetic problem with her? Are there suggestions? I've read about an illness and an inborn issue for hens who don't lay shells, but I haven't heard about ones who also tend to lay two eggs at a time. Thanks!