Hello, I have been having problems with my incubators the past few years. two years ago about half the chicks didn't hatch and after waiting and waiting sure enough when i opened them up to see how far they did develop they had formed 100% but the liquid left in the shell was "foamy" and very sticky. the ones that did hatch had the same foamy sticky goo on them, so i sterilized my incubators thinking maybe something bad had grown in them a fungus or something but the next year i had not quite as bad but still had about 20 % of the chicks not hatch and the foamy sticky goo. temp and humidity stayed in the normal the whole time, can't figure it out. any suggestions? maybe my gauges are broken or something ? would like to get my hatch rate up.