I'm needing some help. A few weeks ago I put 45 Silkie eggs in lockdown in my incubator I use for hatching. A couple days ago I put 7 call duck eggs I need the hatcher and I candled them today and 6 are dead?!!!??!! I have a humidifier make specifically for incubators and a hygrometer in the incubator. I don't have a thermometer in there at the moment but the incubator has been staying at a steady 99.5 temp. Why did the ducks die?