What do you mean with "attached to a bone" you mean probably being a child of a bone node.
Can you provide your player model? So we can have a look.
I assume you did it wrong since the way you normally do a player character and the way the default soldier is build, is that you have an armature and then below that your models including all LOD levels, so that each model ends up having an armature modifier that transforms the mesh according the the bone movement.
So at no point there is any mesh attached to a bone, there are only bones attached to bones which then can have bones or nodes for mount points, eye points etc.
Well its hard to explain, but just import the default soldier of the template and you will.
I did not try it but I think the hitboxes are supposed to be like a LOD version, since it is an LOD version like a collision level, so you would make it as a LOD version and place it to the other LOD versions, so it will get affected by the same armature modifier as everything else.