Why does my level up / DataStore system not save the XP and the XPNeeded Values?

So i have this script which is supposed to make a leaderstat and 2 other IntValues in the player, and it does this really well but the Datastore part does not save the XP and XPNeeded (The 2 values which are not in the leaderstats), But it saves the Levels even when im in studio. Why is this and how do i fix it?

The script:

local DataStore = game:GetService("DataStoreService")
local ds1 = DataStore:GetDataStore("Level")
local ds2 = DataStore:GetDataStore("XP")
local ds3 = DataStore:GetDataStore("XPNeeded")
local success, err = pcall(function()

game.Players.PlayerAdded:connect(function(player)
	local leader = Instance.new("Folder", player)
	leader.Name = "leaderstats"
	------------------------------------------
	local level = Instance.new("IntValue", leader)
	level.Name = "Level"
	level.Value = ds1:GetAsync(player.UserId) or 1
	ds1:SetAsync(player.UserId.."-Level", level.Value)
	------------------------------------------
	local xp = Instance.new("IntValue", player)
	xp.Name = "XP"
	xp.Value = ds2:GetAsync(player.UserId) or 0
	ds2:SetAsync(player.UserId.."-XP", xp.Value)
	------------------------------------------
	local XPN = Instance.new("IntValue", player)
	XPN.Name = "XPNeeded"
	XPN.Value = ds3:GetAsync(player.UserId) or 1000
	ds3:SetAsync(player.UserId.."-XPNeeded", XPN.Value)
	
	 xp.Changed:connect(function()
		print("+XP SAVING")
  		if xp.Value >= XPN.Value then	
  		player.leaderstats.Level.Value = player.leaderstats.Level.Value + 1
			XPN.Value = XPN.Value + 500
    		XPN.Value = XPN.Value
			xp.Value = 0
		ds1:SetAsync(player.UserId.."-Level", level.Value)
		ds2:SetAsync(player.UserId.."-XP", xp.Value)
		ds3:SetAsync(player.UserId.."-XPNeeded", XPN.Value)
			else
			ds1:SetAsync(player.UserId.."-Level", level.Value)
			ds2:SetAsync(player.UserId.."-XP", xp.Value)
			ds3:SetAsync(player.UserId.."-XPNeeded", XPN.Value)
		end
		

  
game.Players.PlayerRemoving:connect(function(player)
	
	local SavedData = Instance.new("BindableEvent")
	ds1:setAsync(player.UserId, player.leaderstats.Level.Value)--Level
	ds2:setAsync(player.UserId, player.XP.Value)--XP
	ds3:setAsync(player.UserId, player.XPNeeded.Value)--XPNeeded
	print("SavingData")
	print("Player Left")
	
	SavedData:Fire()

game:BindToClose(function()
    SavedData.Event:Wait()
end)
end)
end)
end)
end)

Im guessing the issue is in the saving part because when i run the game the "+XP Saving" print does get printed out and the "Player left" at the end does not.

If you're running this in studio then you may want to turn on the setting "Enable Studio Access to API Services"