The Charlotte Hornets ultimately just didn't have the bodies to keep up with a healthy and more talented Atlanta Hawks team. Without LaMelo Ball and Miles Bridges, not to mention Brandon Miller, Tre Mann, Josh Okogie, and others, they just didn't have the gas to go a full 48 without slipping behind and staying there.
It's difficult to keep up with an NBA team with some of the rotations Charlotte had to use. They never looked particularly awful, they just looked totally outmatched. The Hawks, conversely, just kept hitting baskets consistently and slowly building a substantial lead.