It sounds strange. I have 12 wonderful gals that are all laying as of this summer. I keep the coop and nests spotless. I collect eggs at least 3 times per day and spend lots of time with my chickens. I have never had a chicken poop in the nests. I have one EE that has been laying a grimy egg each day. It comes out all spotted with what looks like little, grainy, brown, drops of poop. I've actually seen them come out of her this way. It's like it's been paint splattered. Within a few seconds it is dry and the poopy spots look very chalky. However, if I get a wet paper towel and try to wipe it down the color comes out and it reminds me of a robin's egg although much larger. She's a healthy, happy, social, bird that eats and hangs out with everyone else. All the other eggs I get are spotless. Why are her eggs like this?