Leaderstats kills not working?

Can someone please explain to me why the kills are not working on this leaderstats script? Thanks!

local Players = game.Players

local Template = Instance.new 'BoolValue'
Template.Name = 'leaderstats'

Instance.new('IntValue', Template).Name = "Kills"
Instance.new('IntValue', Template).Name = "Deaths"


Players.PlayerAdded:connect(function(Player)
	wait(1)
	local Stats = Template:Clone()
	Stats.Parent = Player
	local Deaths = Stats.Deaths
	Player.CharacterAdded:connect(function(Character)
		Deaths.Value = Deaths.Value + 1
		local Humanoid = Character:FindFirstChild "Humanoid"
		if Humanoid then
			Humanoid.Died:connect(function()
				for i, Child in pairs(Humanoid:GetChildren()) do
					if Child:IsA('ObjectValue') and Child.Value and Child.Value:IsA('Player') then
						local Killer = Child.Value
						if Killer:FindFirstChild 'leaderstats' and Killer.leaderstats:FindFirstChild "Kills" then
							local Kills = Killer.leaderstats.Kills
							Kills.Value = Kills.Value + 1
						end
						return
					end
				end
			end)
		end
	end)

end)

I see. Player.CharacterAdded won't fire when a player joins or the Players.PlayerAdded event. To fix this, you create a Script inside StarterCharacterScripts.

Why put in StarterCharacterScripts? It's because everything inside StarterCharacterScripts will be moved to the player's character once it loaded/respawned. Not only it will be moved, but making a Script a descendant of Workspace (Player.Character is a descendant of Workspace too) will automatically start running the script.

After creating the Script, copy this code:

local Players = game:GetService("Players")

local Character = script.Parent
local Humanoid = Character:FindFirstChildOfClass("Humanoid")
local Player = Players:GetPlayerFromCharacter(Character)

local Stats: Folder = Player:FindFirstChild("leaderstats")
local Kills: IntValue = Stats:FindFirstChild("Kills")
local Deaths: IntValue = Stats:FindFirstChild("Deaths")

Humanoid.Died:connect(function()
	for _, Child in pairs(Humanoid:GetChildren()) do
		local Killer = Child.Value
		
		if Child:IsA("ObjectValue") and Killer and Killer:IsA("Player") then
			local OtherStats = Killer:FindFirstChild("leaderstats")
			local OtherKills = OtherStats:FindFirstChild("Kills")
			
			if OtherStats and OtherStats:IsA("Folder") and OtherKills and OtherKills:IsA("IntValue") then
				Deaths.Value += 1
				OtherKills.Value += 1
			end
		end
	end
end)

Make another Script inside ServerScriptService and this is where we make the leaderstats.

local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(Player)
	local Stats = Instance.new("Folder", Player)
	Stats.Name = "leaderstats"
	
	local Kills = Instance.new("IntValue", Stats)
	Kills.Name = "Kills"
	
	local Deaths = Instance.new("IntValue", Stats)
	Deaths.Name = "Deaths"
end)

After doing all that, you may now delete your old leaderstats script.