I have a pair of mandies and the duck started laying on the 12th of this month, she has laid 11 eggs, she was hiding them with straw in the nest box up until the tenth egg, yesterday she seemed to spend the whole day in the box with the male outside keeping guard, today she is back out and I checked the nest, there is now down feathers in the nest and 11 eggs but not covered up and they were all stone cold, is that normal?