My first hatch is underway with some Marans and Ameraucana eggs. All but one have pipped and one is zipping. All have normal looking white membranes except this one that has a more greenish tan membrane. I attached a picture of it and the zipping one for comparison. I know tan membranes are supposed to mean your humidity was too low and it has gotten tough, but is it possible for only one egg in the incubator to be having this problem?