what type of eggs/breed? Were they shipped or your own eggs?
One odd egg with that problem would be strange, but to have so many in one clutch with the same issue makes me think either a genetic problem, or some problem with incubation...
I'll see what I can find.
Here's an excerpt from my favorite incubation troubleshooting page:
http://edis.ifas.ufl.edu/AA204
Sign: Hemorrhage. Causes:
Red skin -- incubator or hatcher temperature too high.
Bleeding in chorioallantois -- rough handling at transfer.
Nutritional deficiencies (vitamin K or vitamin E).
Embryos that died at days 11 to 15 and appear small and dark red -- usually caused by molds or other contamination.
ALSO:
Sign: Unhealed navel, wet, odorous; mushy, large, soft-bodied, and lethargic chick. Causes:
Omphalitis (navel infection). Contamination from dirty trays, unsanitary machines or hatchery, dirty eggs, inadequate egg sanitation or fumigation.
Low incubator temperature.
High incubator or hatcher humidity.
Inadequate ventilation.
So, looks like a common theme here is potential contamination/infection in the incubator, OR vitamin K/E deficiencies, which would mean either a vitamin deficiency in the hens, OR some genetic issue that prevents proper formation or absorption of those vitamins.
