How do i stop Duplication of Items in the Inventory?

Hello Fellow Programmers!

So, First, All the events and Items are kept in ReplicatedStorage where they both can be seen by the server and the Client.

So, I decided to make a GUI Shop Button where a person selects an Item and Gets the following Details

I made a Module script for the buttons so that I don't use the same functions over and over again

And then I made a Server script called ItemTransaction where the Process takes place

But whenever I buy a second item, the first item always duplicates.

So here is the Code

MODULE SCRIPT

local replicatedStorage = game:GetService("ReplicatedStorage")
local PurchasingEvent = replicatedStorage.Events.PurchasingEvent
local player = game.Players.LocalPlayer
local module = {}

module.DisplayFunc = function(ItemName,Description,Price)
    local DisplayFrame = game.Players.LocalPlayer.PlayerGui.GameShopGui.DisplayFrame
    DisplayFrame.DisplayText.Text = Description
    DisplayFrame.Price.Text = Price
    DisplayFrame.BuyButton.MouseButton1Click:Connect(function()
        PurchasingEvent:FireServer(ItemName,Price)
    end)
end


return module

GUI BUTTON CODE

DisplayModule = require(game.ReplicatedStorage.Module.ModuleScript)
local ItemName = "Grenade"
local Button = script.Parent
local Price = 50
local Description = "KABOOOOOM!!"


Button.MouseButton1Click:Connect(function()
    DisplayModule.DisplayFunc(ItemName,Description,Price)
end)

MAIN SERVER SCRIPT

local replicatedStorage = game:GetService("ReplicatedStorage")
local PurchasingEvent = replicatedStorage.Events.PurchasingEvent
local InsufficientMoneyEvent = replicatedStorage.Events.InsufficientMoneyEvent
local OwnedEvent = replicatedStorage.Events.OwnedEvent

PurchasingEvent.OnServerEvent:Connect(function(player,ItemName,Price)
    local tool = replicatedStorage.Items:FindFirstChild(ItemName)
    if tool then
        if player.leaderstats.Gold.Value >= Price then
            print(ItemName)
            local Item = tool:Clone()
            Item.Parent = player.Backpack
            player.leaderstats.Gold.Value -= Price
            Item = nil
        else
            InsufficientMoneyEvent:FireClient(player)
        end
    else
        print("Error")
    end
end)

If you know where is the error, please tell me.

Thank you very much for listening.