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.