This is albumin dried onto them, sometimes from a difference in egg size or shell porosity. Rinse them off under warm water and put them back into the incubator until they do fluff up. It may be very hard for them to get their balance while still "hairsprayed".
Some individual eggs may be vitamin deficient even when parent stock are fed a balanced diet.
This could be unabsorbed yolk. Sometimes putting some triple antibiotic ointment is suggested to help avoid yolk sac infection (omphalitis). Many chicks do recover from this.
This could be what's known as splay leg,
unless it's a deformity.
You might try putting them inside a small cup lined with a cloth or paper towel, inside the incubator, to see if they can build some leg strength. This has helped many chicks get their land legs under them.
They do not need the chick starter yet and should be viable on just the yolk for upto 72 hours after hatch.
Vitamin water may be good.. poultry nutri drench sometimes works miracles (it doesn't require digestion to work).. hold the chick in one hand with beak facing the bend in the forfinger, using that bend to help catch and direct the drip and drip a small drop just below the nostrils.. as the drop rolls around into the beak the chick will naturally gobble/swallow.
Not every chick that hatches will make it.
Congrats on your healthy babies!
Best wishes for these two to recover quickly and start to thrive!