[Q]This is roblox bug or my script problem sword cloning, coloring?

Hi, i'm c0nc3rt. I have another serious proplem that when you clone the sword and random the pos and pick it up it will back to black color.

It's really hard to explain just watch this video: here

And this is my script inside a serverscript:

local sword = game.ServerStorage.RareSword

while true do
    sword.Handle.Position = Vector3.new(math.random(-2.82,250.81),30,math.random(-49.54,283.46))
    sword.Handle.Mesh.VertexColor = Vector3.new(math.random(0,255),math.random(0,255),math.random(0,255))
    sword:Clone().Parent = workspace
    workspace.Value.Value = workspace.Value.Value + 1

    wait(5)
end

Help me please...