This egg was set the day it hatched, the temp in the incubator has been pretty steady and stuff is hatching on time or maybe a day early.Lots of things cause this. Many will say humidity but it is anything that messes up with development.
What happens is that the chick does not develop enough to absorb the yolk and then the yolk remnants act like glue. Shipping, flock health, temps off in the incubator and etc.
