I have had two like that. I kept taping their feet hoping for the toes to straighten out but the remained rubbery so long I finally gave up. I wish I had taped them just before 12 or so weeks, as that is when they finally firmed up.
SInce I didn't they always walked on the sides. It did not seem to bother them, until they bot got an infection in the tucked under toe. I decided to cull as they were getting worse and worse, and it would not ever end.
If they had not gotten infected, I think they would have been fine- none of the other chickens minded, they ate, and could walk fine. I did install a handicapper ramp, with sticky shelf liner instead of raised boards, as their balance was off a little.
Good luck!
Jayne