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)