My "Cash on Kill" script is only repeating itself 2 times and then not working at all?

local Human = script.Parent:WaitForChild"Humanoid"
local Player = game.Players:GetPlayerFromCharacter(script.Parent)
Human.Died:Connect(function()
	if Player then
		local Krak = Player:FindFirstChild"leaderstats":FindFirstChild"Krak" 
		if Krak then
			Krak.Value = Krak.Value - 20 
		end
	end
	local Creator = Human:FindFirstChild"creator"
	if Creator and Creator.Value and 
		Creator.Value:FindFirstChild"leaderstats" and 
		Creator.Value.leaderstats:FindFirstChild"Krak" then 
		Creator.Value.leaderstats["Krak"].Value = Creator.Value.leaderstats["Krak"].Value + 25 
	end
end)

I have this script here, it's supposed to go inside of Zombie and give the player 25 dollars ("Krak" the name of the currency I'm using for my game) every time the humanoid reaches 0 health. It works for the first two times that the script runs but then it just appears to run but not yield any Krak. There is no output into the console whatsoever. I have tried for days doing research with one of my friends to find any possible issues, we found nothing. I'm hoping its just a simple fix I could get some help with here. Below is also my leaderboard script if that helps any. Thanks in advance!

local Players = game:GetService("Players")

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

	local Krak = Instance.new("IntValue")
	Krak.Name = "Krak"
	Krak.Value = 10000
	Krak.Parent = leaderstats
end

Players.PlayerAdded:Connect(leaderboardSetup)

I would recommend doing it like this, this script goes inside the thing to kill:

local tagHelp = script.Parent

script.Parent:FindFirstChild("Humanoid").Died:Connect(function()
	if tag ~= nil then
		if tag.Value ~= nil then
			local leaderstats = tag.Value:FindFirstChild("leaderstats")
			local krak = leaderstats:FindFirstChild("Krak")
			if krak then
				krak.Value += 20
			end
		end
	end
end)

In your weapon script that deals the damage do this:

local function tagCreator(NPC, player)
		local Creator_Tag = Instance.new("ObjectValue")
		Creator_Tag.Name = "creator"
		Creator_Tag.Value = player
		Creator_Tag.Parent = NPC
		game:GetService("Debris"):AddItem(Creator_Tag, 2)
		Creator_Tag.Parent = game.Workspace:FindFirstChild(NPC.Name)
end

--Un tags the victim if someone has already tagged them
local function unTag(NPC)
	for i, v in pairs(NPC:GetChildren()) do
		if v:IsA("ObjectValue") and v.Name == "creator" then
			v:Destroy()
		end
	end
end

In the weapon script where the weapon checks if the object is a player and damages them add this:

local NPCthing = Humanoid.Parent

unTag(NPCthing)
tagCreator(NPCthing, player)

If you need any help with what I mean feel free to ask :) Also if there are any errors just say.