Making one part more "vindex" than another?

So the current script is something like this, even if it doesn't really have anything to do with the problem addressed.

Mouse.Button2Down:connect(function()
local Clone = game.ServerStorage.RightClick:clone()
	if not Player.PlayerGui.ScreenGui:FindFirstChild("RightClick") and Mouse.Target.Name == "Part" then
		Clone.Parent = Player.PlayerGui.ScreenGui
		Clone.Position = UDim2.new(0, ((Mouse.X)-90), 0, ((Mouse.Y)-20))
		Clone.Spot.Value = Mouse.Target.Name
		wait(.5)
		print(Clone.Spot.Value)
	end 	
end)

So, my issue is when I right click the part, the one under it is the one selected. Any ideas on how I could address this problem?