How to fix model cloning multiple times?

Every time i cancel placement model start cloning multiple times.

local Placement = {}
local UserInputService = game:GetService("UserInputService")
local RunService = game:GetService("RunService")
local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
Placement.MaxPlacingDistance = 300
Placement.CanStart = true
Placement.CanPlace = true
Placement.IsPlacing = false
Placement.CanRotate = true
Placement.CanCancel = true
Placement.Placed = false
Placement.PlacedName = "Unknown"
local PreviewModel
local Rotation = 0
local Target = nil
local Pos = nil
local Norm = nil
function SnapPositions()
	if PreviewModel then
		local RayIgnoreList = {Player.Character, PreviewModel}
		local MouseRay = Mouse.UnitRay
		local NewRay = Ray.new(MouseRay.Origin, MouseRay.Direction.unit * Placement.MaxPlacingDistance)
		Target, Pos, Norm = workspace:FindPartOnRayWithIgnoreList(NewRay, RayIgnoreList)
	end
end
function MoveModel()
	if PreviewModel then
		SnapPositions()
		EndPosX = Pos.X + (Norm.X * (PreviewModel.PrimaryPart.Size.X * 0.5))
		EndPosY = Pos.Y + (Norm.Y * (PreviewModel.PrimaryPart.Size.Y * 0.5))
		EndPosZ = Pos.Z + (Norm.Z * (PreviewModel.PrimaryPart.Size.Z * 0.5))
		PreviewModel:SetPrimaryPartCFrame(PreviewModel.PrimaryPart.CFrame:Lerp(CFrame.new(EndPosX, EndPosY, EndPosZ) * CFrame.Angles(0, math.rad(Rotation), 0), 0.2))
	end
end
function RotateModel(Input, Other)
	if Input.KeyCode == Enum.KeyCode.Q then
		if PreviewModel then
			Rotation = Rotation + 45
		end
	end
end
function PlaceModel()
	if Placement.IsPlacing and Placement.CanPlace then
		script.PlaceModelEvent:FireServer(EndPosX, EndPosY, EndPosZ, Rotation, PreviewModel.Name)
		Placement.Placed = true
		Placement.PlacedName = PreviewModel.Name
		wait(0.01)
		Placement.Placed = false
		Placement.PlacedName = "Unknown"
		wait(0.05)
	end
end
function Placement.CancelPlacementFromScript()
	Placement.IsPlacing = false
	Placement.CanPlace = true
	Placement.CanStart = true
	Placement.CanRotate = true
	PreviewModel:Destroy()
	PreviewModel = nil
end
function CancelPlacement(Input, Other)
	if Input.KeyCode == Enum.KeyCode.X then
			if Placement.CanCancel and Placement.IsPlacing then
				Placement.IsPlacing = false
				Placement.CanPlace = true
				Placement.CanStart = true
				Placement.CanRotate = true
				PreviewModel:Destroy()
				PreviewModel = nil
			end
	  end
end
function Placement.StartPlacing(Model)
	if Placement.CanStart and not Placement.IsPlacing and not PreviewModel then
		Placement.CanPlace = true
		Placement.CanStart = false
	 	Placement.IsPlacing = true
		PreviewModel = Model:Clone()
		PreviewModel.Parent = workspace
		local PreviewModelChildren = PreviewModel:GetChildren()
		for i, v in pairs(PreviewModelChildren) do
			if v:IsA("BasePart") then
				v.CanCollide = false
				v.Anchored = true
				v.Transparency = 0.55
			end
		end
		UserInputService.InputBegan:Connect(RotateModel)
		UserInputService.InputBegan:Connect(CancelPlacement)
		Mouse.Button1Down:Connect(PlaceModel)
		while wait(0) and Placement.IsPlacing == true do
			MoveModel()
		end
	end
end
return Placement

When i cancel placing and start placing again multiple models appear. Error: https://youtu.be/wqk2KcA4EOQ