Scene2D UI Adding 3 elements

Newbie & Debugging Questions
#1

Hey folks,

Can anyone give me a hand with this? I’ve been tearing my hair out for about 3 days now.

This code:

public void manage(final GameScreen screen) {
        Window window = new Dialog("Manage Wall", screen.game.skin, "dialog");
        window.setMovable(false);
        screen.stage.addActor(window);
        screen.stageShowing = true;
        
        Button accept = new TextButton("Accept", screen.game.skin);
        window.add(accept).center();
        
        window.setX((screen.getResX() / 2) - (window.getWidth() / 2));
        window.setY((screen.getResY() / 2) - (window.getHeight()/ 2));
        
        window.debug();
    }

Produces this result:

I have no idea why there are 2 empty elements in the window, nor how to get rid of them.

Any advice appreciated.