My GUI cloning script wont clone the gui under the original?

What you need to do is parent "guiObject" to the player's gui.

You are cloning it, but when you clone it is not actually ingame. The same applies to Instance.new() and many other similar functions.

Hello. Here is a more explained version of Raccoonyz's answer.

When a player is added, an object/instance gets created inside the player called PlayerGui. It is the container for the guis the player has on-screen. The guis that get cloned are inside StarterGui, another container.

So, you must parent the cloned gui to the PlayerGui.

Also, you must first create a ScreenGui and then put the object in it as TextLabels that aren't parented to a ScreenGui will not show up on-screen.

Add this code to the script (make sure it's a LocalScript):

game.Players.LocalPlayer:WaitForChild("PlayerGui") -- Waits for the PlayerGui to load

while true do
    wait(0.2)
    local screenGui = Instance.new("ScreenGui")


    local guiObject = script.Parent:Clone() -- creates a clone of parent

    guiObject.Position = UDim2.new(0,0, 0.2,0.1)

    guiObject.Parent = screenGui

    screenGui.Parent = game.Players.LocalPlayer.PlayerGui

    wait(0.2)
end

Also, when you use Clone(), the object is made but not parented. To parent it, you must use the "Parent" property.