World.SpawnAsset give me three obj, why 3?

template:
image

code:

result:

'self._config.model' is a asset ref of the template. so.
3 AnimatedMeshs appears in editor at runtime when I use 'World.SpawnAsset' create object as the code above? why 3? the AnimatedMesh on the top of ball is what I want. what's wrong?

 In addition, translate the MUID of the Mesh Spawned on server  to client by Events.Broadcast,  on client, I use code:
local mesh = World.FindObjectById(muid)

could not found the object. 'mesh' is nil. why?.

well, what can I do when I want to spawn a mesh or other object on server but find the instance on client