e.preventDefault() not working

e.preventDefault() not working

Guys
I have a table which rows are generated with a click event of an element.
Now, this works perfectly, the problem is with the delete part. For
example I have already added 5 rows, when I click the delete button (the
delete button is created through JQuery too on the addRow() click event),
all rows added through the JQuery function are being deleted and the form
is submitting event though I have an e.preventDefault() method called.
Javascript/JQuery code:
var counter = 2;
window.addRow = function addRow() {
var newRow = $('<tr><td><label>'+ counter
+'</label></td><td><textarea name="txtActionStep' + counter +
'" style="width:300px; height: 50px;
word-wrap:break-word;"></textarea></td><td valign="top"><input
type="text" name="txtOwner' + counter + '"/></td><td><button
class="delete">delete</button></td></tr>');
counter++;
$('table.actionsteps-list').append( newRow );
}
$('table.actionsteps-list').on('click', '.delete', function(e){
e.preventDefault(); // stops the page jumping to the top
$(this).closest('tr').remove();
});
function postForm() {
var form = document.getElementById('actionStepsForm');
document.getElementById('rowCount').value = counter-1;
form.submit();
}
HTML Code (the form itself):
<form name="actionStepsForm" id="actionStepsForm"
action="add_reprocessing.php?action=add" method="post">
<table class="actionsteps-list" width="510">
<tr>
<th colspan="3" align="left">Action Steps</th>
</tr>
<tr>
<td>Step #</td><td>Action Step</td><td>Owner</td>
</tr>
<tr>
<td>
<label>1</label>
</td>
<td>
<textarea name="txtActionStep1" style="width:300px;
height: 50px; word-wrap:break-word;"></textarea>
</td>
<td valign="top">
<input type="text" name="txtOwner1" />
</td>
</tr>
</table>
<table width="510">
<tr>
<td align="right"><a href="#" title="" onclick="addRow();
return false;">Add Action</a></td>
</tr>
</table>
<input type="button" value="Create" onclick="postForm(); return
false;" />
<input type="hidden" value="" id="rowCount" name="rowCount" />
</form>
Believe it or not, I've been stuck here for almost 3 days now. I can't
find any fix online. I don't what's wrong.