Sample to reproduce:

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {

    VBox root;

    @Override
    public void start(Stage stage) {
        stage.setTitle(this.getClass().getSimpleName());
        stage.setScene(new AppScene());
        stage.setVisible(true);
    }

    public static void main(String[] args) {
        launch(Main.class, args);
    }

    public class AppScene extends Scene {
        public AppScene() {
            super(root = new VBox());

            Text text1 = new Text(" Nodes trev ttat");
            Text text2 = new Text("Nodes trev ttat");

            root.getChildren().add(text1);
            root.getChildren().add(text2);
        }
    }
}