i'm making a spin system, but i need help in one thing?

I need help because when I click spin I get two "quirks", let's call them a quirk, the new quirk doesn't replace the old one, is there any method to make the previous quirk be replaced? If you need the script, I'll put what clones the quirk in the player's backpack.

local classes = game.ServerStorage.Classes

script.Parent.SpinEvent.OnServerEvent:Connect(function(plr, item, rarity)

local class = classes:FindFirstChild(item)

    if class then
        local cloned = class:Clone()
        cloned.Parent = plr.Backpack
    end
end)    

have the local script that make i get the class

local plr = game.Players.LocalPlayer
local cooldown = 3
local debounce = false
local defaultbackroundcolour = script.Parent.Parent.Result.BackgroundColor3

local backround = {

    {Rarity = "Common", Colour = Color3.fromRGB(255, 255, 255)},
    {Rarity = "Rare", Colour = Color3.fromRGB(0, 255, 0)},
    {Rarity = "Epic", Colour = Color3.fromRGB(126, 31, 185)},
    {Rarity = "Legendary", Colour = Color3.fromRGB(255, 255, 0)},

}

local item = {

    {Name = "OFA", Rarity = "Legendary"},
    {Name = "Ice", Rarity = "Rare"},
    {Name = "HHHC", Rarity = "Epic"},
    {Name = "Fire", Rarity = "Common"},

}

local lootTable1 = {

    {Item = item[1], Weight = 5},
    {Item = item[2], Weight = 37},
    {Item = item[3], Weight = 12},
    {Item = item[4], Weight = 0},

}

local function returnSumOfWeight(lootTable1)

    local sum = 0
    for i, entry in ipairs(lootTable1) do
        sum = sum + entry.Weight
    end
    return sum

end

local function getRandomItem(lootTable1)

    local randomNumber = math.random(returnSumOfWeight(lootTable1))

    for i, entry in ipairs(lootTable1) do
        if randomNumber <= entry.Weight then
            return entry.Item
        else
            randomNumber = randomNumber - entry.Weight
        end

    end

end

script.Parent.MouseButton1Click:Connect(function()
    if debounce == false then
        debounce = true

        for count = 1, 30 do
            local item = getRandomItem(lootTable1)
            script.Parent.Parent.Result.Text = item.Name
            wait(.05)
        end


        local item = getRandomItem(lootTable1)
        local name = item.Name
        local rarity = item.Rarity

        script.Parent.SpinEvent:FireServer(name, rarity)
        script.Parent.Parent.Result.Text = name
        for i, v in ipairs(backround) do
            if v.Rarity == rarity then
                script.Parent.Parent.Result.BackgroundColor3 = v.Colour
            end
        end

        wait(cooldown)
        script.Parent.Parent.Result.Text = ""
        script.Parent.Parent.Result.BackgroundColor3 = defaultbackroundcolour
        debounce = false
    end
end)