Why does my button stop working?

In my Tycoon I have a button takes away the players iron (from leaderboard) and creates a block. When the player has iron, the button works as it should. If they hit the button while they have 0 iron by accident and then afterwards hit it when they do have iron, the button no longer works. Why is that? It's not showing any issues in the script output.

Upgradecost = 1

owner = script.Parent.Parent.Parent.OwnerName

local debounce = false



function onTouched(hit) 
    if debounce then return end
debounce = true 
    check = hit.Parent:FindFirstChild("Humanoid") 

    if check ~= nil then
    if hit.Parent.Name == owner.Value then 
        local user = game.Players:GetPlayerFromCharacter(hit.Parent) 
        local stats = user:findFirstChild("leaderstats") 

        if stats ~= nil then 
            local Iron = stats:findFirstChild("Iron") 
            if Iron.Value > (Upgradecost-1) then 

                Iron.Value = Iron.Value - Upgradecost 
                Part = Instance.new("Part", game.Workspace)
                Part.Anchored = false
                Part.CFrame = CFrame.new(-385.1, 8, -224)
                Part.Size = Vector3.new(1,1,1)
                Part.BrickColor = BrickColor.new(199)
                Part.Name = "Iron"

                wait(1)
debounce = false
            end
        end
    end
    end
end

script.Parent.Touched:connect(onTouched)