Many players are experiencing difficulties when trying to hit skeletons in the wild, even though the option to hit NPC humans is enabled.
Skeletons are not Human NPC's in the API. i think this plugins last update was before the last rw update that introduced skeletons. also read somewhere about skeletons having small hit box's. if players cannot hit them at all i would say its the plugin. if its just hard to hit them i would say its the hit box's.