FWIW, I’m pretty sure College of Charleston is a public school. Many schools give no need based aid beyond what someone else provides (such as Pell, federal loans, state grants, etc.). Many privates can’t afford it, and many publics either can’t afford it or limit their aid to in-state residents. Run the NPC for the schools in question and see if what you get on the NPC is similar to what they’ve offered. If so, it’s likely not a mistake.