The girls started laying about 2 1/2 weeks ago. The last few days I've gotten 8 eggs from 12 hens. There are 3 large nest boxes that I built. They measure 30" wide x 20" tall x 12" deep. I hung two on one wall at the darker end of the coop and one under the window by the roost. The box under the window is the favorite. I know they are trying out the other boxes because there are 2 small nest spaces in each, including the one they prefer. They are all laying in the right side of the same nest box.....could this be a problem? Thanks