I have a saving money script but it doesn't work, what is the problem here?

i have this script

local currencyName = "Point"
local DataStore = game:GetService("DataStoreService"):GetDataStore("TestDataStore")
game.Players.PlayerAdded:Connect(function(player)

    local folder = Instance.new("Folder")
    folder.Name = "leaderstats"
    folder.Parent = player  

    local currency = Instance.new("IntValue")
    currency.Name = currencyName
    currency.Parent = folder
    currency.Value = 0
local ID = currencyName.."-"..player.UserId
    local savedData = nil   

    pcall(function()
        savedData = DataStore:GetAsync(ID)
    end)

    if savedData ~= nil then
        currency.Value = savedData
        print("Data loaded")
    else
        -- New player
        currency.Value = 0
        print("New player to the game")
    end


end)

game.Players.PlayerRemoving:Connect(function(player)
    local ID = currencyName.."-"..player.UserId
    DataStore:SetAsync(ID,player.leaderstats[currencyName].Value)
    print("Saved")
end)

game:BindToClose(function()

    -- When game is ready to shutdown

    for i, player in pairs(game.Players:GetPlayers()) do
        if player then
            player:Kick("This game is shutting down")
        end
    end

    wait(3) 

end)

shop script

local price = script.Parent.Parent.Price
local tools = game:GetService("ReplicatedStorage"):WaitForChild("Tools")
local tool = tools:FindFirstChild(script.Parent.Parent.ItemName.Value)
local player = script.Parent.Parent.Parent.Parent.Parent.Parent

script.Parent.MouseButton1Click:Connect(function()
    if player.leaderstats:WaitForChild("Point") then
        if player.leaderstats.Point.Value >= price.Value then
             player.leaderstats.Point.Value =  player.leaderstats.Point.Value - price.Value
            local clone = tool:Clone()
            clone.Parent = player.Backpack

            local clone2 = tool:Clone()
            clone2.Parent = player.StarterGear
        end
    end
end)

Actually, it works. When you play, if you buy the Points from the gamepass, the points is still be saved. But when you use that points to buy things in shop, the script doesn't save the points which have been decrease. Can anyone solve the problem? Thanks you guys a lot