Is your humidity high enough? That first one especially sounds like it may be stuck because of shrink-wrapping. That can be caused by low humidity in the incubator. They can be notoriously slow to finish hatching, but once they start to zip, mine usually finish before that. That does not sound right.
With the one with the yellow liquid, it sounds like it may be an issue with the yolk not being fully absorbed. It should not leak like that though. I'd be concerned with that one. I have not seen that. Hopefully someone with direct experience can comment on that.
If you open the incubator to add water to increase the humidity, you take the risk of letting even more humidity out. I made a thing with some straws with that accordian joint so I could add water to the reservoirs through the vents. I got a big syringe from
Tractor Supply to put the water in the straw. If you decide to open it, I suggest you use pretty warm water so it will evaporate faster and get the humidity back up quicker. Some people mist the incubator when they open it.
I shring wrapped a chick once when I opened the incubator after it pipped. It had its beak out where it could breathe but was glued to the membrane and could not move. It was still alive when the rest of the hatch was over and I took the other chicks out. I carefully peeled the hard shell off, leaving the membrane behind. Then I soaked the chick in a cup of warm water to soften the membrane and gently got most of the membrane off. Then I put it back in the incubator to dry off. The down was glued down and looked awful, but I put that chick with the others with a broody hen. She accepted it and raised it. The down looked funky for 4 to 5 days, but it cleared itself up. That chick did great.
I do not advocate opening the incubator during hatch any more than you absolutely have to, but sometimes you need to do what you need to do.
Deciding when to intervene is real hard. Between internal pip and actually hatching, a lot of things go on inside that egg shell. The yolk needs to be absorbed, blood vessels inside the shell but external tot he chick need to dry up. There are other things going on. Some chicks do a lot of that between internal pip and external pip. These usually zip pretty soon after external pip. Some wait until external pip to do this. These are the ones that worry us because they take so long to zip. A few even zip before they are totally ready. If we intervene too early, we are likely to kill the chick.
This might not be a humidity issue. I really don't know. You are on the spot and have to make the decisions. When something is going on with the hatch, that can be difficult. I tend to not intervene unless the need is obvious and desperate. Good luck!
