I will post some pictures, At first I saw only one hen's egg this way, now I have seen all 3 hens eggs have a bulls eye white design on one side of the egg... originally I thought t was cause they were laying near the heat lamp, but the other day it was found in the nesting box. recently the bedding of shavings has a mix of a saw dust powder look to it? Should I be Concerned? are those eggs eatable? it has been getting cold lately in the 20 and teen degrees and I have one heat lamp in the coop. Please let me know your thoughts????