The last few hatches from shipped eggs I have had 3/9 4/9 1/4 2/7 2/12 3/9 hatch. The second number was not the eggs set, but the eggs at lockdown. This time I put 28 eggs into lockdown, 7 hatched, but one is fat and can't stand. Temperature was at 99.5 in a still air with 60-65% humidity. The temperature did dip half a day to 97-98 when someone changed the house thermostat. The eggs were set at 99.5 in a forced air incubator using the dry hatch method. I cleaned the incubator out with white vinegar the week before. Could the cold weather be doing this? I just blamed that until my home eggs only hatched 3/9 (they usually are ~100%) Using Little Giants I eggtopsied the last hatch, 3 internal pips 3 died early and 3 external pips not hatched. The rest were fully formed, dead in shell. Some were starting to blacken.