Reporting
It is hard to diagnose
It is hard to diagnose without knowing more about their appearance and conditions. Here are a few thoughts: Is it possible that they were not getting enough water and food at the supply store? Is your brooder too hot? The chicks like it less than 90 degrees or you'll see them flatten themselves out. For the weak chick left, try electrolyte water or Pedialyte for a few days. In terms of the wing feathers turning outward, it might be a 'frizzle' breed and this is normal.