I can not append

I can not append

My code has a button that when pressed it include a html element. But when I click the button the included information blink and disappears, what's wrong?

$('#nwelem').click(function() {
  $('ul.addedRow').append('<li><div><h4>some text</h4></div></li>');
});

<ul class="addedRow">
  <li>
    <div>
          <p>Added</p>                    
    </div>
  </li>
</ul>