That is interesting you've had so many issues, especially given it's through an incubator i have never used one, couldn't handle the stress lol. Hard enough with birds doing it, many of the bantams require assistance regardless. Good luck with your hatches!
Thx Quackers! Clutches 1 and 3 were incubator, #2 was under a silkie, and #4 is under a cochin, so lets see what pops out....if anything. *rolling eyes*