Zipped and died / Membrane like porcelin????

[wolftracks]

I have a hatch due tomorrow and notice my humidity was about 4 % lower than I was comfortable with. I thought I had left a hatching cage in that should have been pulled, but it was for this hatch. Don't remember using it. Anyway I look inside and see the date on the eggs and then notice an AM egg that has zipped, so I check it and the chick is dead. Then I took it out I taped the egg and then touched the membrane. There's no give and that thing is cement hard. I'm dry hatching, so I try to stay around 55% -62%. Mush higher and i get sticky chicks who pip and die. I've never seen anything like this. I hear another egg peeping in there somewhere and hoping I don't lose more. AGAIN!

My humidity was 56%. I've had them hatch at 53%, so this is just really weird to me.

Has anyone seen this and why would it happen?

 

[nurse_turtle]

Never had anything like that happen. It could have been like and egg in an egg that somehow formed an embryo and the chick had 2 shells to pip through and that's just too much to ask.

 

[wolftracks]

That would mean no membrane at all. It's the strangest thing. I've just really never seen this.