DataStore doesnt save... Help is much appreciated!?

Hi, ive got this leaderstat script with a database to save my coins, gems and rebirths.

local DataStoreService = game:GetService("DataStoreService")

local playerData = DataStoreService:GetDataStore("PlayerData")

local function onPlayerJoin(Player)
    local leaderstats = Instance.new("Folder", Player)
    leaderstats.Name = "leaderstats"

    local val1 = Instance.new("StringValue",Player)
    val1.Name = 'GotPet'
    val1.Value = ''

    local val2 = Instance.new("StringValue",Player)
    val2.Name = 'OpenValue'
    val2.Value = ''

    local Gems = Instance.new("IntValue", leaderstats)
    Gems.Name = "Gems"
    Gems.Value = 0

    local Rebirths = Instance.new("IntValue", leaderstats)
    Rebirths.Name = "Rebirths"
    Rebirths.Value = 0

    local Coins = Instance.new("IntValue", leaderstats)
    Coins.Name = "Coins"
    Coins.Value = 0

    local playerUserId = "Player_" .. Player.UserId  --Gets player ID

    local Success, Result = pcall(function()
        return playerData:GetAsync(playerUserId)
    end)

    if Result then
        print("Data found!")

        Coins.Value = Result[1] -- // Since in the saving part, Coins are the one that is set as the first value of the table, we set Coins as [1]
        Rebirths.Value = Result[2]
        Gems.Value = Result[3]
    else
        print("DataStore working but No data found")
        warn(Result)
    end

end

local function onPlayerExit(player)  --Runs when players exit



    local success, Err = pcall(function()
        print("Data Saved successfully")

        local playerUserId = "Player_" .. player.UserId

        playerData:SetAsync(playerUserId, {player.leaderstats.Coins.Value, player.leaderstats.Rebirths.Value, player.leaderstats.Gems.Value}) -- Now set as a table instead of individually

    end)



    if not success then
        warn(Err)
        warn('Could not save data!')
    end
end

game.Players.PlayerAdded:Connect(onPlayerJoin)

game.Players.PlayerRemoving:Connect(onPlayerExit)

It dont work :( Now i have another script that adds gems and coins, could it be stopping it from working and how could i fix it?

local player = game.Players.LocalPlayer
local Codes = script.Parent:WaitForChild("holder"):WaitForChild("Codes"):GetChildren()
local CodeText = script.Parent.holder.__Codes.__EnterCode:WaitForChild("EnterCode")

local Cash = player:WaitForChild("leaderstats"):WaitForChild("Coins")
local Gems = player:WaitForChild("leaderstats"):WaitForChild("Gems")

script.Parent.holder.__Codes.__Confirm:WaitForChild("Confirm").MouseButton1Click:connect(function()
    for i, v in pairs(Codes) do
        if CodeText.Text == v.Name then
            if v.Redeemed.Value == false then
                Cash.Value = Cash.Value + v.CashToGive.Value
                Gems.Value = Gems.Value + v.GemsToGive.Value
                    game.Workspace.Sounds.MoneySound:Play()
                local Trans = script.Parent.holder.__Codes.Success
                Trans.TextTransparency = 0
                Trans.TextStrokeTransparency = 0
                v.Redeemed.Value = true
                wait(2.5)
                for i = 0, 1, 0.1 do
                    wait(0)
                    Trans.TextTransparency = i
                    Trans.TextStrokeTransparency = i

                end
            end
        end
    end
end)

This is just a simple twitter code gui thingy that gives gems and or coins.