My hens have just started to lay. So we're getting eggs sporadically. Yesterday and today I've found an egg that has no shell. It looks perfectly normal except it's just got a leathery membrane instead of a shell. Inside it is a perfect egg. I'm assuming it is one of the Rhode Island Reds since it's brown in color. I'm feeding them Layena which is supposed to have everything they need to make eggs. Why would I get ones with no shell?