Is Afpscharacter inheriting from ACharacter? If so, make sure to attach your FPSMesh to Root component. If not, make sure you attach it somewhere, or make it the root component if you want that.
If that doesn’t fix it, I would recommend reparenting your blueprint to actor, then saving, and then reparenting again to Afpscharacter. Sometimes blueprints can get corrupted like that, I’ve seen it in the past a few times