Adding to a number just resets it to it's original value

Help and Feedback Scripting Support
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1

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!
    I’m working on a tycoon game where you have to print money and own a buisness illegally.
    I’m working on a pad that increases the printer security.
  2. What is the issue? Include screenshots / videos if possible!
    It just adds it, and resets it to it’s original value:

I would upload a video if roblox could.
3. What solutions have you tried so far? Did you look for solutions on the Developer Hub?
I have but they were dealing with value objects
After that, you should include more details if you have any. Try to make your topic as descriptive as possible, so that it’s easier for people to help you!

First script:

local PrinterUpgrader = {}
PrinterUpgrader.__index = PrinterUpgrader


function PrinterUpgrader.new(Part,Type, Amount, Cost)
	local Upgrader = setmetatable({}, PrinterUpgrader)
	local ReplicatedStorage = game:GetService("ReplicatedStorage")
	local EventsFolder = ReplicatedStorage.Events
	local WantsToUpgradeEvent = Instance.new("BindableEvent")
	local Upgraded = Instance.new("BindableEvent")
	local SoundService = game:GetService("SoundService")
	Upgrader.WantsToUpgrade = WantsToUpgradeEvent.Event
	Upgrader.Upgraded = Upgraded.Event
	Upgrader.Type = Type
	Upgrader.Part = Part
	Upgrader.Amount = Amount
	Upgrader.Cost = Cost
	local Printer = EventsFolder.GetPrinterObject:Invoke()
	local Prompt = Instance.new("ProximityPrompt", Part)
	Prompt.ObjectText = "Printer Upgrader"
	Prompt.ActionText = "Upgrade"
	Prompt.RequiresLineOfSight = false
	
	Prompt.Triggered:Connect(function(player) 
		WantsToUpgradeEvent:Fire(player)
		if player:WaitForChild("leaderstats"):WaitForChild("Cash").Value >= Cost then
			print('Can afford')
			player:WaitForChild("leaderstats"):WaitForChild("Cash").Value -= Cost
			ReplicatedStorage.Events.PlaySound:FireClient(player, game.SoundService.SpentMoney)
			if Type == "Security" then
				Printer.Security += Amount
				print("Printer Security: " .. Printer.Security)
				Upgraded:Fire(player)
			elseif Type == "Amount" then
				Printer.PrintAmount += Amount
				Upgraded:Fire(player)
			elseif Type == "Paper" then
				Printer.Paper += Amount
				Upgraded:Fire(player)
			end
		end
	end)
	return Upgrader
end
return PrinterUpgrader

Second script

local Printer = {}
Printer.__index = Printer

function Printer.new(model)
	--Variables (Initialization and Declaration)
	local SoundService = game:GetService("SoundService")
	local ReplicatedStorage = game:GetService("ReplicatedStorage")
	local NewPrinter = setmetatable({}, Printer)
	local PrintedEvent = Instance.new("BindableEvent")
	NewPrinter.Paper = 15
	NewPrinter.Security = 10
	NewPrinter.PrintAmount = 15
	NewPrinter.Printed = PrintedEvent.Event
	local Prompt = Instance.new("ProximityPrompt", model)
	Prompt.ObjectText = "Printer"
	Prompt.ActionText = "Print Money"
	Prompt.RequiresLineOfSight = false
	--Behavior
	Prompt.Triggered:Connect(function(player)
		local cash = player:WaitForChild("leaderstats"):WaitForChild("Cash")
		if cash:IsA("IntValue") and NewPrinter.Paper > 0 then
			cash.Value += NewPrinter.PrintAmount
			game.ReplicatedStorage.Events.PlaySound:FireClient(player, game.SoundService.GainMoney)
			NewPrinter.Paper -= 1
			NewPrinter.Security -= 1
		end
		
		if NewPrinter.Security == 0 then
			Prompt:Destroy()
			ReplicatedStorage.Events.PlaySound:FireClient(player, SoundService:WaitForChild("CopsArrival"))
			player:Kick("The cops caught you printing cash")
		end
		PrintedEvent:Fire(player)
	end)
	return NewPrinter
end
return Printer

Please do not ask people to write entire scripts or design entire systems for you. If you can’t answer the three questions above, you should probably pick a different category.