enemy NPC spams walking and idle after there are no unit NPC in the field, how do i fix this?

This was pretty painful to fix though i wont get answers in this website and i still need more activities reading to get post in devforum..

Though ill send the video and script to see what hell is happening https://streamable.com/gifvbq

local npc = script.Parent
local global = require(game.Workspace.Enviroment.GlobalVar)

local baseunit = game.Workspace.Enviroment["Base-unit"]
local baseenemy = game.Workspace.Enviroment["Base-Enemy"]

local part = Instance.new("Part")
local weld = Instance.new("WeldConstraint")

weld.Part0 = npc:WaitForChild("HumanoidRootPart")
weld.Part1 = part; weld.Parent = part

part.Name = 'Hitbox'
part.Anchored = false; part.CanCollide = true
part.Massless = true
part.CanCollide = false
part.Transparency = 0.5
part.Size = Vector3.new(3.2, 5.8, 3.8)
part.CFrame = (npc.HumanoidRootPart.CFrame + Vector3.new(0, 0, -part.Size.Z *0.5))
part.Parent = npc

local animation = {
	idle = npc.Idle,
	run = npc.Run,
	atk = npc.Attack
}


local IdleTrack = npc.Humanoid:LoadAnimation(animation.idle)
local AttackTrack = npc.Humanoid:LoadAnimation(animation.atk)
local RunTrack = npc.Humanoid:LoadAnimation(animation.run)

--RunTrack.Looped = true
--IdleTrack.Looped = true

local animtable = {
	['idle'] = IdleTrack,
	['run'] = RunTrack,
	['atk'] = AttackTrack
}

local animstring = 'run'

local pathfinding_service = game:GetService("PathfindingService")

local timer = nil
local idleTimer = 0
local timeAfterAtk = 1.4

local isOn = false

function HasChild(Name, Model)
	for _, Child in pairs(Model:GetChildren()) do
		if Child.Name == Name then
			return true
		end
	end
	return false
end

function onHit()
	if (timer ~= nil and timer <= 0) and isOn then
		for i, entity in pairs(game.Workspace.Unit:GetChildren()) do
			if game.Workspace.Unit:FindFirstChild(entity.Name) then
				local relativePos
				if HasChild('HumanoidRootPart',entity) then
					relativePos = npc.Hitbox.CFrame:pointToObjectSpace(entity:WaitForChild("HumanoidRootPart").Position)
				end
				if HasChild('HumanoidRootPart',entity) and math.abs(relativePos.X) <= npc.Hitbox.Size.X * 1 * 0.5 and math.abs(relativePos.Z) <= npc.Hitbox.Size.Z * 1 * 0.5 then
					entity.Humanoid:TakeDamage(55)
					print(tostring(entity.Name)..' HIT!')
				else
					print(tostring(entity.Name)..' Dodged!')
				end
			end
		end
		timer = nil
		isOn = false
		idleTimer = timeAfterAtk
	end
end

local curWalk = npc.Humanoid.WalkSpeed

isOn2 = true

function lerp(a, b, t)
	return a + (b - a) * t
end

while wait() do
	if npc.Humanoid.Health <= 0 then
		task.wait(2)
		for i,v in pairs(npc:GetChildren()) do
			if v:IsA("Part") or v:IsA('MeshPart') then
				npc:FindFirstChild(v.Name).CFrame = CFrame.new(Vector3.new(0,-20,0))
			end
		end 
		break
	end

	if AttackTrack.IsPlaying or IdleTrack.IsPlaying or idleTimer >= 0 then
		npc.Humanoid.WalkSpeed = 0
		print('is my reddummy man idling??')
	elseif idleTimer <= 0 then
		npc.Humanoid.WalkSpeed = curWalk
		print('is my reddummy man walking??')
	end
	if not animtable[animstring].isPlaying then
		for i,v in pairs(animtable) do	
			animtable[i]:Stop()
		end
		animtable[animstring]:Play()
	end
	
	npc.Humanoid:MoveTo(baseunit.Position + Vector3.new(8,0,0))

	for i, entity in pairs(game.Workspace.Unit:GetChildren()) do
		if idleTimer < 0 and (npc:FindFirstChild('HumanoidRootPart').Velocity.Magnitude) >=0.004 and not isOn then
			animstring = 'run'
		else
			animstring = 'idle'
		end
		if game.Workspace.Unit:WaitForChild(entity.Name) then
			local hitbox = npc:WaitForChild('Hitbox')
			local relativePos
			if HasChild('HumanoidRootPart',entity) then
				relativePos = hitbox.CFrame:pointToObjectSpace(entity:WaitForChild("HumanoidRootPart").Position)
			end
			if idleTimer <= 0 and entity:WaitForChild("Humanoid").Health > 0 and math.abs(relativePos.X) <= hitbox.Size.X * 0.8 * 0.5 and math.abs(relativePos.Z) <= hitbox.Size.Z * 0.8 * 0.5 then
				--print(tostring(entity.Name).." is inside")
				animstring = 'atk'
				if not isOn then
					timer = 0.8
				end
				isOn = true
			elseif idleTimer > 0 and entity:WaitForChild("Humanoid").Health > 0 and math.abs(relativePos.X) <= hitbox.Size.X * 0.8 * 0.5 and math.abs(relativePos.Z) <= hitbox.Size.Z * 0.8 * 0.5 then
				animstring = 'idle'
			end
		end
	end
	onHit()
	if timer ~= nil and timer >= 0 then
		timer -= 0.015
	end
	if idleTimer >= 0 then
		idleTimer -= 0.015
		--print(idleTimer)
	end
end

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