My script only works in roblox studio however not in the actual game?

``01    game.Players.PlayerAdded:Connect(function(Plr)
02      local stats = Instance.new("Folder", Plr)
03      stats.Name = "Data"
04      --- Level System
05      local Levels = Instance.new("IntValue", stats)
06      Levels.Name = "Levels"
07      Levels.Value = 1
08      local Exp = Instance.new("IntValue", stats)
09      Exp.Name = "Exp"
10      Exp.Value = 0
11      local ExpNeed = Instance.new("IntValue", stats)
12      ExpNeed.Name = "ExpNeed"
13      ExpNeed.Value = 200
14      --- Money System
15      local Beli = Instance.new("IntValue", stats)
16      Beli.Name = "Beli"
17      Beli.Value = 0
18      local Bounty = Instance.new("IntValue", stats)
19      Bounty.Name = "Bounty"
20      Bounty.Value = 1
21      --- Stats Text
22      local HealthP = Instance.new("IntValue", stats)
23      HealthP.Name = "HealthP"
24      HealthP.Value = 0
25      local MeleeP = Instance.new("IntValue", stats)
26      MeleeP.Name = "MeleeP"
27      MeleeP.Value = 0
28      local SpeedP = Instance.new("IntValue", stats)
29      SpeedP.Name = "SwordP"
30      SpeedP.Value = 0
31      local DevilFruitP = Instance.new("IntValue", stats)
32      DevilFruitP.Name = "DevilFruitP"
33      DevilFruitP.Value = 0
34      --- Stats System
35      local Points = Instance.new("IntValue", stats)
36      Points.Name = "Points"
37      Points.Value = 0
38      local MaxHealth = Instance.new("IntValue", stats)
39      MaxHealth.Name = "MaxHealth"
40      MaxHealth.Value = 0
41      local Melee = Instance.new("IntValue", stats)
42      Melee.Name = "Melee"
43      Melee.Value = 0
44      local Speed = Instance.new("NumberValue", stats)
45      Speed.Name = "Sword"
46      Speed.Value = 0
47      local DevilFruit = Instance.new("IntValue", stats)
48      DevilFruit.Name = "DevilFruit"
49      DevilFruit.Value = 0
50      --- Sword
51      local Sword = Instance.new("StringValue", stats)
52      Sword.Name = "SwordOwned"
53      Sword.Value = "None"
54      --- Melee
55      local Melee = Instance.new("StringValue", stats)
56      Melee.Name = "MeleeOwned"
57      Melee.Value = "Combat"
58      --- CurrentBoat
59      local CurrentBoat = Instance.new("StringValue", stats)
60      CurrentBoat.Name = "CurrentBoat"
61      CurrentBoat.Value = "None"
62   
63  end)
64   
65  game.Players.PlayerAdded:Connect(function(Plr)
66      wait(.1)
67      local Exp = Plr.Data.Exp
68      local Levels = Plr.Data.Levels
69      local ExpNeed = Plr.Data.ExpNeed
70      local Points = Plr.Data.Points
71   
72      while wait() do
73              if Exp.Value >= (100 * (Levels.Value + 1)) and Levels.Value <= 399 then
74              Levels.Value = Levels.Value + 1
75              Points.Value = Points.Value + 3
76              Exp.Value = Exp.Value - ExpNeed.Value
77              ExpNeed.Value = ExpNeed.Value + 100
78              game.ReplicatedStorage.LevelSystem.LevelUpGui:FireClient(Plr)
79          end
80      end
81  end)``

~So whats SUPPOSED to happen is you load in at level 1 with zero money (beli) and you need to get 200 exp to level up. This is what happens for me and it works fine.

~However, for my friends, it spawns them in at level 0, they have zero money (beli) and they need to collect 100 exp. The MAIN PROBLEM HOWEVER is that every time they level up they KEEP 100 exp.

------EXAMPLE: Say I am my friend who is level 0 and needs to collect 100 exp. I complete my quest that gives me 100 exp. I should now be at 0/200 exp for my total number of points and level 1. However it makes it so after I level it's 100/200.(if i level again it would be 100/300 if i got another 100 exp). Ik it's confusing im trying but if you have a solution it would be very appreciated. Thx.