Why does my kills leaderstats not work?

My leaderstats only works for the deaths, but only for me. The kills do not work at all. The captures work as well.

local leaderstats = Instance.new('Model', player)
	leaderstats.Name = 'leaderstats'
	
	local Captures = Instance.new('IntValue', leaderstats)
	Captures.Name = 'Captures'
	Captures.Value = 0
	
	local Kills = Instance.new('IntValue', leaderstats)
	Kills.Name = 'Kills'
	Kills.Value = 0
	
	local Deaths = Instance.new('IntValue', leaderstats)
	Deaths.Name = 'Deaths'
	Deaths.Value = 0
	
	local Players = game.Players

	

	Players.PlayerAdded:Connect(function(player)
		wait(1)
		local Stats = leaderstats: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)

Can you tell me why the kills are not working? Thanks!

Top of your script is a bit confusing, but I assume that you have more above it.

First thing I notice is the wait(1) after the player joins. This makes it so the first time they spawn in, you don't detect their character, suggest that be removed (could also be a reason why kills don't work if you only test/kill the other player one time). Also when you add deaths, you should do it when they die instead of when they spawn in.

I also see that you use quite a bit of unnecessary if statements, like checking for the humanoid (if theres no humanoid, theres obviously something wrong), but if you like keeping them there, you should probably print something after to make sure its passing the point in the script.

example of how you could change your script (sorry if it looks weird, only intended to send the characteradded function at first)

Players.PlayerAdded:Connect(function(player)
local Stats = leaderstats:Clone()
Stats.Parent = player
local Deaths = Stats.Deaths

player.CharacterAdded:Connect(function(Character)
	local Humanoid = Character:WaitForChild("Humanoid")
	Humanoid.Died:Connect(function()
		Deaths.Value += 1 -- deaths should be added 
		local creator = Humanoid:FindFirstChild'creator' -- how roblox swords marks their killer, can use Humanoid:FindFirstChildOfClass'ObjectValue' if its different, assuming this based on how your script was set up. using this rather than a loop is a lot more efficient 
		if creator then
			local killer = creator.Value
			local ls = killer:WaitForChild('leaderstats')
			ls.Kills.Value += 1
		end
	end)
end)

end)