Color Changing Egg?

[Chickaroo!]

It seems that the past 2 or 3 days, one of my chickens eggs are much lighter in color? She hasn't been eating anything different. Why would this be happening?

 

[ella]

As they get older and the shell gets a little thinner it's possible that the color may lighten a bit. A drastic change is usually because a different hen has layed it.

 

[Chickaroo!]

I pretty certain that it's from the same hen as always. I only have 3 and only 2 of them lay. One's eggs are much smaller then the others. It's like one end is dark like usual and then the color fades as it goes to the other end!