one of my wyandotte hens has been laying weird eggs this week. i have seen it happen 3 times so far (today i saw her actually lay it) where she lays an egg that looks like it has a very soft shell that just breaks apart, or could just be an egg with a thick membrane with no shell? every time, patty the hen grabs the egg and runs away from the other chickens, and proceeds to peck at it / try to eat it. until a few days ago she was laying normal eggs (as far as i know). our chickens are free range, eat all organic laying feed, get supplemented with lots of goodies. most of our hens only started laying in the last 2 months and we don't extend light exposure in the coop. i have read that this can be due to calcium problems; any reason why one hen would be having problems and not the others? anything else can cause this to happen?