So sorry to hear about your hatches.
Get a good quality thermometer to double check your incubator, and make sure to check that it is accurate. I really recommend the Brinsea spot check, it is very accurate and easy to use in just about any incubator. Many thermometers have a +/- 2 degrees range, meaning they can vary as much as 4 degrees - not very helpful in incubators
I also wonder about the chicks that did hatch - on time? Normal? Did the quitters start developing, or just candle clear?
Get a good quality thermometer to double check your incubator, and make sure to check that it is accurate. I really recommend the Brinsea spot check, it is very accurate and easy to use in just about any incubator. Many thermometers have a +/- 2 degrees range, meaning they can vary as much as 4 degrees - not very helpful in incubators
I also wonder about the chicks that did hatch - on time? Normal? Did the quitters start developing, or just candle clear?