Yep, when the humidity is too high during incubation, you will see chicks hatching with 'mushy chick' syndrome. And too high humidity can cause 'stuck' chick syndrome...which is different from a shrink wrapped chick. There is too much fluid surrounding the chick and it can't 'turn' properly, it keeps 'sliding' back to the same point it began pipping and can't 'zip'. When the chick takes a long time in zipping, from my observations, they will have 'curled toes' or other leg deformities.
Some peeps tend to ignore the humidity and worry about temperature.(that's close enough) attitude toward humidity isn't conducive to a good hatch. Under incubator conditions (unnatural) humidity plays an important part in determining the outcome of the hatch and the viability of the chicks.
Sorry for the novel, I'm off my rant.