I have a problem with 2x money gamepass Can someone help me?

Hello! Everytime i leave my game and rejoin, my money get doubled. Can Someone help me? here's my script

game.Players.PlayerAdded:Connect(function(player)

local marketservice = game:GetService("MarketplaceService")

local can = true
repeat wait() until player:FindFirstChild("leaderstats")
local leader = player:FindFirstChild("leaderstats")
if leader then
    repeat wait() until leader:FindFirstChild(script:WaitForChild("Currency").Value)
    local currency = leader:FindFirstChild(script:WaitForChild("Currency").Value)
    if currency then
        local folder = Instance.new("Folder",player)
        folder.Name = "2xGamepass"
        local oldmoney = Instance.new("IntValue",folder)
        oldmoney.Name = "OldMoney"
        oldmoney.Value = currency.Value
        local give2x = Instance.new("IntValue",folder)
        give2x.Name = "Give2x"
        give2x.Value = 0

        currency.Changed:Connect(function()
            if marketservice:UserOwnsGamePassAsync(player.UserId, script:WaitForChild("GamepassId").Value) then


                if can == true then
                    can = false
                    if currency.Value > oldmoney.Value then
                        give2x.Value = currency.Value - oldmoney.Value

                        currency.Value = currency.Value + give2x.Value

                        oldmoney.Value = currency.Value
                        can = true
                    else

                        oldmoney.Value = currency.Value
                        can = true


                    end

                end
            else
                oldmoney.Value = currency.Value
            end
        end)

    end
end

end)