ADDITIONAL SYSTEM INFORMATION :
JDK 11.0.3 on a Windows 1ß 64 bit system
Two monitors, main monitor standard, left of it same monitor but scaled by 125%


A DESCRIPTION OF THE PROBLEM :
The very first time a Jpopupmenu is shown on a second monitor which is scaled, the popup is shown at the wrong position.
When I show the popup the second time it shows correct.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the program and move the window to the scaled monitor.
Click the button and it shows a popup at the clickpoint

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Popup shows where i clicked
ACTUAL -
Popup shows on wrong location +x, -y

---------- BEGIN SOURCE ----------
package com.itzmedi.viewer.viewing;

import java.awt.FlowLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPopupMenu;

public class TestGD implements MouseListener {
    private JPopupMenu popup = null;
    
    public static void main(String[] args) {
        new TestGD().go();
    }
    private void go() {
        JButton btn = new JButton("click");
        btn.addMouseListener(this);

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());
        frame.add(btn);
        frame.setSize(300,100);
        frame.setVisible(true);
    }
    @Override
    public void mousePressed(MouseEvent e) {
        popup = new JPopupMenu();
        popup.add(new JLabel("Lorem"));
        popup.add(new JLabel("ipsum"));
        popup.add(new JLabel("dolor"));
        popup.add(new JLabel("sit"));
        popup.show((JButton)e.getSource(), e.getPoint().x, e.getPoint().y);
    }
    @Override
    public void mouseReleased(MouseEvent e) {
        if (popup != null) {
            popup.setVisible(false);
        }
    }
    @Override public void mouseEntered(MouseEvent e) { }
    @Override public void mouseExited(MouseEvent e) { }
    @Override public void mouseClicked(MouseEvent e) { }
}
---------- END SOURCE ----------

FREQUENCY : always