Roblox Studio: Shop System - roblox

Question

Hello,
I have a shop system that half works. It has one problem. When you buy something from the shop, your money goes down, as it's suppose to. But then if you get more money, the number of your money springs back up to what it was, plus it gives you the new money that you got. I don't know how to fix it. This is the code.
local price = script.Parent.Parent.Price
local tools = game.ReplicatedStorage:WaitForChild("Tools")
local tool = script.Parent.Parent.ItemName
local player = script.Parent.Parent.Parent.Parent.Parent.Parent
script.Parent.MouseButton1Click:connect(function()
if player.leaderstats:FindFirstChild("Money").Value >= price.Value then
player.leaderstats:FindFirstChild("Money").Value = player.leaderstats:FindFirstChild("Money").Value - price.Value
game.ReplicatedStorage.ShopBuy:FireServer(tool.Value)
end
end)
This is the code that puts the item in the inventory:
local tools = game.ReplicatedStorage:WaitForChild("Tools")
game.ReplicatedStorage.ShopBuy.OnServerEvent:Connect(function(player,tool)
local clone = tools:FindFirstChild(tool):Clone()
clone.Parent = player.Backpack
local clone2 = tools:FindFirstChild(tool):Clone()
clone2.Parent = player.StarterGear
end)

Answer 1

Changes made in LocalScripts aren't replicated to everyone. Which means that the changes only appear for you. If you want to update your leaderstats, make the change in a Script.
To fix your problem, move the price check into the Script that is handling the ShopBuy RemoteEvent.
local item = script.Parent.Parent
local shopBuy = game.ReplicatedStorage.ShopBuy
script.Parent.MouseButton1Click:connect(function()
shopBuy:FireServer(item)
end)
Then parse the details in your server Script.
local tools = game.ReplicatedStorage.Tools
local shopBuy = game.ReplicatedStorage.ShopBuy
shopBuy.OnServerEvent:Connect(function(player, item)
-- get some details about the tool
local toolName = item.ItemName.Value
local price = item.Price.Value
local money = player.leaderstats:FindFirstChild("Money")
-- check that the player has enough money
if money.Value >= price then
money.Value = money.Value - price
-- give the tool
local clone = tools:FindFirstChild(toolName):Clone()
clone.Parent = player.Backpack
local clone2 = tools:FindFirstChild(toolName):Clone()
clone2.Parent = player.StarterGear
end
end)