I would deworm them if you haven't. It may be possible that's the cause. I have 11 laying road islands that are going through there first winter quite well. Im getting multiple colored brown eggs and came across this looking for answers. I see it's fairly common. I'm getting almost pinkish colored eggs and dark brown eggs with specs of darker brown. If i wash them, they all turn to same color(minus the specs, they stay same.)So a colorless/white egg is no concern in a brown egg layer?