ActionPerformed-method executed twice...

Please help!
My program behaves strangely; the actionPerformed method on a button is executed twice. The first execution completes the method as it should and makes changes to the model as it should. Then there comes the second execution triggered BY THE SAME BUTTON AT THE SAME TIME as the first execution. How is this possible? And how to fix things? There are no external triggers to the button.
Here is the example code showing the method actionPerformed and the output that it prints.
* Method to run when an answer is selected
public void actionPerformed(ActionEvent arg0) {
// Printout info on the action
System.out.println("EKO actionPerformed-method at beginning. Game level " + mymodel.getLevel());
System.out.println("EKO action command: " + arg0.getActionCommand());
System.out.println("EKO action was: " + arg0.ACTION_PERFORMED);
System.out.println("EKO action time: " + arg0.getWhen());
// Disable buttons
enableButtons(false);
// Call method setVastattu to notify the observers that an answer
// has already been selected (e.g. probressBar needs to be stopped)
mymodel.setAnswered();
if (arg0.getActionCommand()==mymodel.getKysymys()[1])
System.out.println("EKO answer was correct. Game level " + mymodel.getLevel());
// Call a method to set new choice texts on the buttons and to set the game level one higher
mymodel.levelUp();
System.out.println("EKO after levelUp-method. Game level " + mymodel.getLevel());
else {
JOptionPane.showMessageDialog(this, "Wrong answer!");
mymodel.setWrongAnswer();
EKO actionPerformed-method at beginning. Game level 1
EKO action command: Kuurupiilo
EKO action was: 1001
EKO action time: 1133534802433
EKO answer was correct. Game level 1
EKO levelUp method is setting game level to level 2
EKO after levelUp-method. Game level 2
EKO actionPerformed-method at beginning. Game level 2
EKO action command: Punahilkka
EKO action was: 1001
EKO action time: 1133534805567
EKO answer was correct. Game level 2
EKO levelUp method is setting game level to level 3
EKO after levelUp-method. Game level 3
EKO actionPerformed-method at beginning. Game level 3 <= WHY AGAIN???
EKO action command: Punahilkka <= SAME ACTION HAS ALREADY BEEN HANDLED
EKO action was: 1001 <= SAME ACTION HAS ALREADY BEEN HANDLED
EKO action time: 1133534805567 <= EVEN THE ACTION TIME IS THE SAME...

WOW!
Exactly! I indeed had the actionlistener added twice. I did not even know that it is possible to have several overlapping actionlisteners! Now my code works fine. Thank you very, very much!
Elisa

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PS
I based this on your first, now deleted, thread.
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