Why Part.Touched do the function before touching anything?

this is the script:

if (targetPosition - character.Torso.Position).Magnitude <= 450 and target.Name ~= "Barrier" then

            if side == "Left" then

                lHook1 = character.LeftHook.Handle.LHook1

                grapple = Instance.new("Part")
                grapple.Name = "Grapple"
                grapple.Size = Vector3.new(0.1,0.1,0.1)
                grapple.Position = lHook1.WorldPosition
                grapple.CanCollide = false
                grapple.Massless = true

                grapplePosition = Instance.new("BodyVelocity", grapple)
                grapplePosition.Velocity = CFrame.new(character.Torso.Position, targetPosition).LookVector * grappleSpeed
                grapplePosition.P = 0

                grapple.Parent = workspace

                lHook2 = Instance.new("Attachment", grapple)

                lWire = Instance.new("Beam", lHook1)
                lWire.Color = ColorSequence.new(Color3.fromRGB(0, 0, 0))
                lWire.LightEmission = 0
                lWire.LightInfluence = 1
                lWire.TextureLength = 0.1
                lWire.TextureSpeed = 0
                lWire.Transparency = NumberSequence.new(0)
                lWire.Width0 = 0.1
                lWire.Width1 = 0.1
                lWire.FaceCamera = true

                lWire.Attachment0 = lHook1
                lWire.Attachment1 = lHook2

                wait(0.1)

                grapple.Touched:Connect(function(hit)

                    print(hit)

                    grapple.Anchored = true
                    grapplePosition:Destroy()

                end)

            end

there is an example:

Video

the part that is printed is the part where I shoot