Maybe this chicken has been chained for too long,
Caused by poor blood circulation of chicken feet,
There must be a rope tied to the chicken's feet or the rope is not broken at all, which means there is a rope on the chicken's feet.
You can catch a chicken and have a look.
Either the chicken was hit in the foot,
If the chicken feet are not broken,
It will get better after a while,
If there is a rope on the chicken feet,
It will be two days after you untie the rope.