Who's the responsible party?

Not a double yolked - THAT surprises me. What kind of chickens do you have? You said they were pure bred, but you didn't list the breeds.
I've got a Salmon Favorolles, Silver- laced Wyandotte, a red one I think is Rhode Island, a Cinnamon Queen and a Plymouth Rock. I've also got a Tolbunt Polish Frizzle and a Silver Spangled Appenzeller Spitzhauben(that's a mouthful!) But those 2 lay white eggs.
 
I've got a Salmon Favorolles, Silver- laced Wyandotte, a red one I think is Rhode Island, a Cinnamon Queen and a Plymouth Rock. I've also got a Tolbunt Polish Frizzle and a Silver Spangled Appenzeller Spitzhauben(that's a mouthful!) But those 2 lay white eggs.
Hmmm, I'm honestly not much of an expert. But I have a Barred Plymouth Rock that lays eggs similar to the same color and shape of the egg. It could be your Plymouth, but I can't be sure.
 
It's a glitch egg, its shape and size do not depend on the breed but on the single chicken. So if you get more of the same breed they're not really going to lay the same egg.
 

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