What age are those chicks when they get like that?Hey fellow BYCers can u guys help me. Having a chick emergency and trying to figure out what's on. https://www.backyardchickens.com/t/884833/new-chicks-starting-to-do-this
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If you take a look at the Merks Veterinary Manual, often when the "go down in the legs" it is a deficiency of one of the B vitamins. Thiamin, riboflavin, niacin.
Are you feeding a medicated feed? If so, it has Amprollium which is a thiamin blocker. It should NOT be used long term.
Please describe the age and symptoms. This frequently is mistaken for Mareks when it isn't.