Moving a JLabel with an ImageIcon dynamically, jumps all around the frame

Question

I have a Java Swing question. I am currently coding the game checkers as an exercise. I created the checkers pieces as JLabels with an ImageIcon of the checkers piece. I added a MouseListener to update the x and y locations of the label on the frame, and am using an ActionListener to set the label location every 5 milliseconds based on a timer. It works except that the label jumps around the screen when I am dragging it with the mouse (instead of tracking with the mouse).

Does anybody know what is causing this? Is there an easy solution based on the code I currently have?

I am new to swing stuff so I realize I could be taking the wrong approach entirely. I am unable to attach the image, but it is just a 80 x 80 px square with a solid black circle in the foreground and the background is transparent. Thanks a lot!

package checkers;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.*;

public class Piece2 extends JLabel implements
    ActionListener, MouseListener, MouseMotionListener{

    ImageIcon checkerIcon;
    String color = null;
    Timer t = new Timer(5, this);
    int x, y, width = 80, height = 80;

    public Piece2(int initX, int initY, String color){

        this.x = initX;
        this.y = initY;
        this.color = color;

        t.start();
        setLocation(x, y);
        setSize(width, height);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
        addMouseMotionListener(this);
        addMouseListener(this);

        if(color.equals("Red")){
            checkerIcon = new ImageIcon("/RedChecker.png");
        }
        else if(color.equals("Black")){
            checkerIcon = new ImageIcon("/BlackChecker.png");
        }

        setIcon(checkerIcon);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        setLocation(x, y);
    }

    /**
     * Mouse Event Listeners
     * 
     */
    @Override
    public void mouseDragged(MouseEvent e) { 
        this.x = e.getX(); 
        this.y = e.getY(); 
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        x = x - (x % 50);
        y = y - (y % 50);           
    }

    @Override
    public void mouseMoved(MouseEvent e) {}

    @Override
    public void mouseClicked(MouseEvent e) {}

    @Override
    public void mousePressed(MouseEvent e) {}

    @Override
    public void mouseEntered(MouseEvent e) {}

    @Override
    public void mouseExited(MouseEvent e) {}

    //To test Piece
    public static void main(String[] args){
        Piece2 p1 = new Piece2(0, 0, "Black");
        JFrame frame1 = new JFrame("Test");
        frame1.setSize(800, 800);
        frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame1.add(p1);

        frame1.setVisible(true);
    }
}