Why my hat giver in GUI works only in local (only this player can see this hat)?

Hello, I have script in GUI which giving hat but only person which clicks this button can see this hat. Also script is in local script.

this is this script

local player = game:GetService("Players").LocalPlayer

script.Parent.MouseButton1Click:connect(function()
    if player.Character:findFirstChild("Humanoid") ~= nil and player.Character:findFirstChild("Head6") == nil then
        local g = game.ReplicatedStorage.Berets.ZANDARMERIA.Head6:clone()
        g.Parent = player.Character
        local C = g:GetChildren()
        for i=1, #C do
            if C[i].className == "Part" or C[i].className == "UnionOperation" then
                local W = Instance.new("Weld")
                W.Part0 = g.Middle
                W.Part1 = C[i]
                local CJ = CFrame.new(g.Middle.Position)
                local C0 = g.Middle.CFrame:inverse()*CJ
                local C1 = C[i].CFrame:inverse()*CJ
                W.C0 = C0
                W.C1 = C1
                W.Parent = g.Middle
            end
                local Y = Instance.new("Weld")
                Y.Part0 = player.Character["Head"]
                Y.Part1 = g.Middle
                Y.C0 = CFrame.new(0, 0, 0)
                Y.Parent = Y.Part0
        end

        local h = g:GetChildren()
        for i = 1, # h do
            h[i].Anchored = false
            h[i].CanCollide = false
        end
    elseif player.Character:findFirstChild("Humanoid") ~= nil and player.Character:findFirstChild("Head6") then
        player.Character.Head6:remove()
    end
end)