[SOLVED] My code to purchase items is giving me extra money. Why?

So I created 2 scripts, one where it gives you 10 cash every 10 seconds and one script where when you click a button it gives you a snowball and it subtracts 10 cash from you.

Whenever I purchase the snowball, when the cash increase script loops back, it gives me 20 cash. If I purchase 10 snowballs it gives me 110 cash. Why is this happening??

Here is the script for my cash increase:

-- Variables --
mintime = 10

-- Coding --

local function onPlayerJoin(player)
    while true do
        wait(mintime)
        local cash = player.leaderstats.Cash
        cash.Value = cash.Value + 10
    end
end

game.Players.PlayerAdded:Connect(onPlayerJoin)

Here is the script for my purchasing: The value for the price is 10 and the value for the item is Snow ball.

button = script.Parent
item = script.Parent.ItemInGame.Value
price = script.Parent.Price.Value

script.Parent.ItemInGame.Changed:Connect(function()
    item = script.Parent.ItemInGame.Value
end)

script.Parent.Price.Changed:Connect(function()
    price = script.Parent.Price.Value
end)

button.MouseButton1Click:connect(function()
    local player = game.Players.LocalPlayer
    if player.leaderstats.Cash.Value >= price then
        player.leaderstats.Cash.Value = player.leaderstats.Cash.Value - 10
        game.Lighting[item]:Clone().Parent = player.Backpack
    elseif player.leaderstats.Cash.Value < price then
        button.Text = "Not Enough Money!"
        wait(1.5)
        button.Text = "Purchase"
    end
end)