DataStore Saved with 2 leaderstats but not with 4?

The problem is probally that you are setting the XP and Rank to a saved value, when there most likely is none, try this, might be something else

local dataStores = game:GetService("DataStoreService")
local ds1 = dataStores:GetDataStore("CashDataStore")
local ds2 = dataStores:GetDataStore("LevelDataStore")
local ds3 = dataStores:GetDataStore("RankDataStore")
local ds4 = dataStores:GetDataStore("Total XP")
local defaultCash = 0
local playersLeft = 0
local defaultLevel = 1
local defaultRank = "InK"
local DefaultXP = 0


--[[
    Ok So LStats Are
    Cash
    Level
    Rank
    XP
--]]
game.Players.PlayerAdded:Connect(function(player)

 playersLeft = playersLeft + 1

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

 local Cash = Instance.new("IntValue")
 Cash.Name = "Cash"
 Cash.Value = 0
 Cash.Parent = leaderstats

 local Level = Instance.new("IntValue")
 Level.Name = "Level"
 Level.Value = 1
 Level.Parent = leaderstats

 local Rank = Instance.new("StringValue")
 Rank.Name = "Rank"
 Rank.Value = "Innocent Killer"
 Rank.Parent = leaderstats

 local XP = Instance.new("IntValue")
 XP.Name = "XP"
 XP.Value = 0
 XP.Parent = leaderstats




 player.CharacterAdded:Connect(function(character)

  character.Humanoid.Died:Connect(function(character)
   --Whenever Somebody dies, this event will run

   if character.Humanoid and character.Humanoid:FindFistChild("creator") then
    game.ReplicatedStorage.Status.Value = tostring(character.Humanoid.creator.Value).." KILLED "..player.Name
   end
   if character:FindFirstChild("GameTag") then
    character.GameTag:Destroy()
   end

   player.LoadCharacter()
  end)


 end)

--[[
DATASTORE PLEASE HELP HERE
DATASTORE PLEASE HELP HERE
DATASTORE PLEASE HELP HERE
DATASTORE PLEASE HELP HERE
DATASTORE PLEASE HELP HERE
]]

 local player_data
 local player_data2
 local player_data3
 local player_data4

 pcall(function()
  player_data = ds1:GetAsync(player.UserId.."-Cash") or defaultCash-- 1736284-Cash
  player_data2 = ds2:GetAsync(player.UserId.."-Level") or defaultLevel--1736284 Levels
  player_data3 = ds3:GetAsync(player.UserId.."-Rank") or defaultRank
  player_data4 = ds4:GetAsync(player.UserId.."-XP") or DefaultXP
 end)

 if player_data ~= nil then
  --Player has saved data , load it in
  Cash.Value = player_data
 else
  --New Player
  Cash.Value = defaultCash
 end

if player_data2 ~= nil then
    Level.Value = player_data2
else
    Level.Value = defaultLevel
end

if player_data3 ~= nil then
    Rank.Value = player_data3
else
    Rank.Value = defaultRank
end

if player_data4 ~= nil then
    XP.Value = player_data4
else
    XP.Value = DefaultXP
end

end)

local bindableEvent = Instance.new("BindableEvent")

game.Players.PlayerRemoving:Connect(function(player)

 pcall(function()
  ds1:SetAsync(player.UserId.."-Cash", player.leaderstats.Cash.Value)
  ds2:SetAsync(player.UserId.."-Level", player.leaderstats.Level.Value)
  ds3:SetAsync(player.UserId.."-Rank", player.leaderstats.Rank.Value)
  ds4:SetAsync(player.UserId.."-XP", player.leaderstats.XP.Value)
  print('All ds saved')
  playersLeft = playersLeft - 1
  bindableEvent:Fire()
 end)

end)

game:BindToClose(function()
 --This will be triggered upon shutdown
 while playersLeft > 0 do
  bindableEvent.Event:Wait()
end
end)

Hopes this helps