24% should not cause problems in my opinion. I know a breeder who uses Game bird starter during colder climates for chicks to help them feather out just a little faster... So you really need to check your set-up again just in case.. Also, post pics of your set-up, check their poo daily... monitor each one.. make sure they are eating and drinking! Baby chicks Dehydrate Super fast.. Adding a little electrolytes to their water could help some as well. Contact the hatchery and let them know what you are dealing with. Perhaps they might have info to tell you that they did not.. Let us know how your outcome is! Sorry you are dealing with this.