My leveling up script (with EXP) is not working properly?

I want to make a leveling up system and the EXP script won't work. The script is when you get to 50 EXP you level up. It adds 50 more EXP every level... This is what I have in workspace:

function onPlayerEntered(newPlayer)
wait(.5)
local stats = Instance.new("IntValue")
stats.Name = "leaderstats"


local cash = Instance.new("IntValue")
	
cash.Name = "Level"
cash.Value = 1 --This sets the Level every player starts with

cash.Parent = stats
	
stats.Parent = newPlayer

local cash = Instance.new("IntValue")

cash.Name = "EXP"
cash.Value = 0 --This sets the amount of XP every player starts with

cash.Parent = stats

stats.Parent = newPlayer


local cash = Instance.new("IntValue")

cash.Name = "Money"
cash.Value = 100 --This sets the amount of Money every player starts with

cash.Parent = stats

stats.Parent = newPlayer
end

game.Players.ChildAdded:connect(onPlayerEntered)

This is a separate script that I have in workspace:

function onPlayerEntered(newPlayer) --When a player enters
	L = newPlayer.stats.Level
	e = newPlayer.stats.EXP
	scr = script:clone() --Clones the script so you can give this to EVERYONE
	scr.Parent = newPlayer --Makes the cloned script's parent the newPlayer

	function checkXP() --name of the function
		if e.Value >= 50*L.Value then --if the EXP value is greater than or equal to 50 TIMES the player's level then. 
                                                                     
			L.Value = L.Value+ 1 --Increase a Level
			e.Value = 0 --Reset XP value to 0
		end --end the if statement
	end --end the function
	e.Changed:connect(checkXP) --conneciton for checkXP function
end --end the onPlayerEntered function
game.Players.ChildAdded:connect(onPlayerEntered) --connection for onPlayerEntered function

Please Help...