[We have Rhode Island Reds that lay brown eggs. They have been laying for about 3 weeks. Yesterday and today we found some very large off white eggs that were on the ground, not in or near the nest that all other eggs are layed in. I broke 2 open and they look like normal eggs. We have no roosters so non are fertilized. Are they ok to eat? Why are they different and not layed in the nests?