I've just experienced the same thing....I have 7 pullets, 2 EE among other breeds. Most started laying about a month ago. One, my sapphire gem, just started this week. This morning I went out and collected 6 eggs, only 1 blue/green....figured the other EE took the day off. After a couple of hours I walked by the coop and decided to see if the EE had layed...imagine my surprise when I found 2 more eggs... neither one blue/green! In the picture of 8 eggs (which shows the morning's harvest), of the top 4 eggs of the same color, the bottom left corner one is LARGE and fairly oddly shaped. All of them have a rough surface, same color. The upper right corner one has a very thin shell. One of them was layed on the floor of the coop (there are 3 nesting boxes). The same chicken couldn't possibly have layed 4 eggs! They all seem to be behaving, eating, etc. normally. What's going on?---and NO, I don't have a neighbor playing a trick!
Thanks for any suggestions.....(the 18 count picture is what's
shown up over the last 4 days, just for comparison)