Why isn't the script placing down the object on the Players plot?

I've been trying to find out why on line 50 it won't check if where they place the object is on their plot. I have asked this question before and no one has answered. Please help if you can/

local RunService = game:GetService("RunService")
local UIS = game:GetService("UserInputService")

local Player = game.Players.LocalPlayer
local Char = Player.Character or Player.CharacterAdded:Wait()
local Mouse = Player:GetMouse()
local Camera = workspace.CurrentCamera
local PlaceObject = game.ReplicatedStorage.BuildEvents.PlaceObject

local GivenPlot = game.ReplicatedStorage.BuildEvents.GivenPlot
local PlaceObject = game.ReplicatedStorage.BuildEvents.PlaceObject

local posX 
local posY 
local posZ
local YPos = Vector3.new(-1, 75, 0)
local Rot = 0

local Object
local Plot
local ButtonSoil = script.Parent.ScrollingFrame.Soil.ImageButton

local CanStart = true
IsPlacing = nil
local CanPlace = nil

GivenPlot.OnClientEvent:Connect(function(plt)
	Plot = plt.Name
end)
local function Placement()
	if IsPlacing and CanPlace then
		PlaceObject:FireServer(posX, posY, posZ, Rot, Object.Name)
		
		IsPlacing = false
		CanPlace = false
		CanStart = true
		
		Object:Destroy()
	end
end
local function TopDownView()
	if IsPlacing then
		local playerPos = Char:FindFirstChild("HumanoidRootPart").Position
		local cameraPos = playerPos + YPos
		
		Camera.CFrame = CFrame.new(cameraPos, playerPos)
	end
end
local function Movement()
	if IsPlacing and CanPlace and not CanStart and Mouse.Target and Mouse.Target.Name == Plot.Name then
		Mouse.TargetFilter = Object
	
		posX = math.floor(Mouse.Hit.X / 2 + 0.5)*2
		posY = math.floor(Mouse.Hit.Y / 2 + 0.5)*2 -.5
		posZ = math.floor(Mouse.Hit.Z / 2 + 0.5)*2
		Object.Parent = workspace
		Object:SetPrimaryPartCFrame(CFrame.new(posX, posY, posZ) * CFrame.Angles(0, math.rad(Rot), 0))
	else
		return Mouse.Hit.p
	end
end

local function StartPlacementSoil()
	if CanStart then
		Object = game:GetService("ReplicatedStorage").Soil:Clone()
		Object.Parent = workspace
		Mouse.Move:Connect(Movement)
		IsPlacing = true
		CanPlace = true
		CanStart = false
		
		Mouse.Move:Connect(Movement)
	end
end

local function Rotation(input, GPE)
	if IsPlacing and CanPlace and not CanStart and input.KeyCode == Enum.KeyCode.R then
		Rot = Rot + 90
		
		Object:SetPrimaryPartCFrame(Object.PrimaryPart.CFrame * CFrame.Angles(0, math.rad(Rot), 0))
	end
end

Mouse.Button1Down:Connect(Placement)
ButtonSoil.MouseButton1Click:Connect(StartPlacementSoil)

RunService:BindToRenderStep("Camera", Enum.RenderPriority.Camera.Value, TopDownView)
UIS.InputBegan:Connect(Rotation)