Explain this olive egg thing to me......

They might not have come from an olive egg but someone is mixed and has the EE gene. Got any pictures of your hens? Maybe someone can pick out the olive egg layer.

 

From what I can tell, an olive egger is most commonly a cross between EE and a dark egglayer (usually maran or welsummer). If the rooster was the EE and the hen that laid the egg was the dark egg layer, you can get an olive egger that hatches from an egg which is not olive colored.