I have an npc that shoots at the player but it damages more than expected. Why??

So i have this npc that shoots at the player but it damages more than expected example: when it shoots it hits the player and then it takes more than the expected damage. I have tried using debounce but its not working. The code part is from line 84 to 99

local players = game:GetService("Players")
local ServerStorage = game:GetService("ServerStorage")
local bullet = ServerStorage.Bullet

local NPC = script.Parent
local humanoid = NPC:WaitForChild("Humanoid")

local gun = script.Parent.Gun
local gunHandle = gun:WaitForChild("Handle")
local shootPart = gun:WaitForChild("ShootPart")

local fireRate = 2.5
local damage = 10
local bulletSpeed = 100

local breakLoop = false

local function OnShoot()
    shootPart.GunFlash.Enabled = true
    shootPart.FlashGui.Enabled = true
    shootPart.Swoosh:Play()

    wait(0.5)
    shootPart.GunFlash.Enabled = false
    shootPart.FlashGui.Enabled = false
end

players.PlayerAdded:Connect(function(player)
    player.CharacterAdded:Connect(function(character)   
        local humanoidRootPart = character:WaitForChild("HumanoidRootPart")

        local npcFollowPart = Instance.new("Part")
        local weldConstraint = Instance.new("WeldConstraint", npcFollowPart)

        npcFollowPart.CFrame = humanoidRootPart.CFrame * CFrame.new(0, 0, 7)
        npcFollowPart.CanCollide = false
        npcFollowPart.Transparency = 1

        weldConstraint.Part0 = npcFollowPart
        weldConstraint.Part1 = humanoidRootPart

        npcFollowPart.Size = Vector3.new(1,1,1)
        npcFollowPart.Parent = character
        npcFollowPart.Name = "FollowPart"

        local HoldAnim = NPC:WaitForChild("Hold")

        local controller = NPC.Humanoid
        controller:LoadAnimation(HoldAnim):Play()

        while wait() do         
            if breakLoop == true then
                break
            end

            NPC.Torso.CFrame = CFrame.new(NPC.Torso.Position, character.HumanoidRootPart.Position) 

            NPC.Humanoid:MoveTo(npcFollowPart.Position)

            if humanoid.Health == 0 then
                breakLoop = true

                shootPart:Destroy()             
                NPC.Torso.Oof:Play()
                wait(0.1)
                NPC.HumanoidRootPart:Destroy()
            end
        end     
    end)
end)

while wait(fireRate) do
    local newBullet = bullet:Clone()    
    local ShootAnim = NPC:WaitForChild("Shoot")

    local controller = NPC.Humanoid

    if breakLoop == true then
        break
    end

    controller:LoadAnimation(ShootAnim):Play()

    newBullet.Touched:Connect(function(hit)
        local debounce = false

        local human = hit.Parent:FindFirstChild("Humanoid")

        if human and not debounce then
            debounce = true

            human:TakeDamage(damage)
            shootPart.Swoosh:Stop()
            shootPart.Explosion:Play()

            wait(2.6)
            debounce = false
        end
    end)

    newBullet.Position = shootPart.Position
    newBullet.Parent = game.Workspace       
    newBullet.Velocity = shootPart.CFrame.LookVector * bulletSpeed

    OnShoot()
end