Some times chicks born with curled toes can mean incubator temperature are too high. Double check your temperature, sometimes depending on the incubator there can be spots that have a little higher temperature then other spots. (my incubator was that way it had a bad heat element in it!, threw it out the door!!) Toes can be straighten out with a little cardboard (thin) and tape for a couple days depending how bad they are curled. Good luck!
one of them have fixed itself but the others has got a little better its gone from curled like its gripping on a branch. but now its the end of her toes are curled so if she isnt better by tommorow i will have to give her a boot.