Elements appearing in the up position

I noticed this kinda of event some weeks ago, but I ignored, now it's making me curious. the last element that I add always end up in the up position of the screen, no matter how much I try to alter the positions of the elements created, the result is the same.

It was supposed to have two buttons inline.

import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import static javax.swing.WindowConstants.EXIT_ON_CLOSE; import javax.swing.border.TitledBorder; public class Todolist extends JFrame{ private JLabel jcriar, jtexto, jnum, jtexto1; private JButton btcriar, btrem; private JTextField txtcriar; private JPanel jp; int t = 0; public static void main(String[] args) { JFrame op = new Todolist(); op.setVisible(true); op.setLayout(null); op.setSize(500, 400); op.setDefaultCloseOperation(EXIT_ON_CLOSE); } public Todolist(){ elemen(); } public void elemen(){ jcriar = new JLabel("criar/remover"); txtcriar = new JTextField(); btcriar = new JButton("criar"); btrem = new JButton("remover"); jp = new JPanel(); jp.setBounds(230, 100, 150, 200); jp.setLayout(null); jp.setBorder(new TitledBorder("")); jcriar.setBounds(30, 30, 100, 20); txtcriar.setBounds(131, 30, 100, 20); btcriar.setBounds(232, 30, 80, 20); btrem.setBounds(314, 30, 80, 20); add(jcriar); add(txtcriar); add(btcriar); add(jp); add(btrem); } } }