Hello, I am relatively new to incubating eggs. Standard sized chicken eggs to be exact. My problem is getting them to hatch. I have 3 hatches under my belt and almost every egg that goes into lockdown that doesn't hatch has a fully developped chick that never pipped internally inside when I do an eggtopsy. It's been like this on all three of my hatches. First was a 65% hatch rate on shipped eggs that travelled a short distance, second was 55% with shipped eggs over a great distance, and third was local bought eggs with a 57% hatch rate. What do these 3 hatches have in commun dead fully developed chicks that did not hatch and a rotten egg smell coming from incubator at days 20-22 I have found that not all eggs that did not hatch are rotten 1 or 2 in each of the 3 hatches were actually stinky. Humidity I try and keep at 40% from days 1-18 and 60-65% humidity from 18-21. Temperature 99.5-100.5 with my brinsea spotcheck. My hygrometer also calibrated and it is on the mark. Incubator and hatcher a hovabator 2362E with electronic thermostat,fan, and auto turner. What am I doing wrong is it too much bacteria in my bator killing the chicks? I mean I thought I would get 85% or better with the local eggs this week but am very disapointed.