Yes, it sometimes happens. It tends to be hard to fix. I find that if it is cause by then spreading there legs after hatching (opposed to hatching out with the problem) to be much easier to fix.
Did you notice this after you put them in a brooder? My first hatch I only had 1 chick and after a few days in the brooder it had splayed legs. I figured it was the newspaper I put down was too slippery. This last batch 23chicks I put in the brooder on the 1/4" wire mesh and have not had a single problem.
give it time they may correct themselves, I had a baby chick with a foot tucked backwards, it hobbled around on the ankle but she fixed her own foot after a week. I didn't cull her because I was just hoping her foot would get better and the mom and other chicks were not pecking her.
