Why do these weapons break when I clone them with a script?

For example, I cloned a sword in the ReplicatedStorage and the script broke! If I put the exact sword in the StarterPack, it would work like a charm. This is the clone script.

Lighting = game:GetService("ReplicatedStorage")

script.Parent.MouseButton1Click:connect(function(clicker)
local Sword = Lighting.NATMSword:clone()
Sword:clone().Parent = script.Parent.Parent.Parent.Parent.Parent.Backpack
end)