OK, I opened the iffy eggs and sure enough they were dead. Most look like they died before yolk absorption (still swimming in liquid), one partially absorbed, two yolk absorbed, and one more that had pipped the membrane (and maybe a blood vessel since there was a little bit of blood) but not the shell before dying. One of the chicks had a really big head. I don't know if that would have been a genetic defect and possibly the reason it died. The one egg that I thought could have had a live chick in it still, I saved for last. And it is still alive! It still hasn't pipped the inner membrane yet so it's back in the bator with a wet paper towel around it to increase the humidity and keep that membrane soft and moist.
CG

CG