Lockdown humidity doesn't cause problems unless it's too low. Not that you want to see condensation in your bator either. I generally strive for 75% for hatch and it often shoots past 85% during chicks breaking out. Can you get a pic of the one you say has intestines hanging out? Yolk, if it doesn't get ruptured can absorb over a day or two, intestines, not usually much you can do. I've seen people talk about putting them back and using a butterfly bandage over it, but never saw much great success with that. You are sure it's intestine and not cord?
Two out of six so far have this yolk sac issue. The first one absolutely has a small part of intestines out. The second one has yolk sac out for sure. I thought about cutting it off so the chick doesn't pull out its own intestines as well...But I'm scared that I don't know where to stop. If this one pulls out intestines and another is born like this I will most certainly risk cutting it. I keep trying to upload photos and it's not letting me as my connection decides when it wants to work being out here in the woods. How bad is condensation because I do see that on my lower half window of incubator. :/ I'm so exhausted.