Within the last week, we have gotten four eggs like this. They appear as a normal egg, the shell is completely intact and are light (almost feel empty). We collect daily and are positive they have not been hiding anywhere in the coop. They do not have a rotten odor. They have been 3-4 different colored eggs, so we know several birds, at least, are laying them. Our egg production has also dropped dramatically, but we attributed that to molting. Please help!