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Sorry - "they" and "their" confused me. Sounds like you're talking about more than one when you use plural pronouns.
Just looked at the pictures. Hard to see what's going on there. I would see how things go, and if its leg keeps popping out, it appears to be in pain or...
So, you have more than one chick with this problem? Go to the search bar at the top of the page and type in "splay leg" or "spraddle leg". It sounds to e like what you might be dealing with. Hard to know without seeing pictures.