jquery nestable does not update

I'm using jquery nestable to create a list of academic programs a prospective student might be interested in. 16 programs pulled from mysql and listed like this:

<ol class="dd-list">

if(mysqli_num_rows($result)) {
    $order = array();
    while($item = mysqli_fetch_assoc($result)) {
        echo '<li class="dd-item" data-id="'.$item['id'].'"><div class="dd-handle">',$item['program'],'</div></li>';
    }

   </ol>
 } else { 
   <p>Sorry!  There are no items in the system.</p>
 }

No issue there. I have a second container to place the programs in:

<div class="dd" id="nestable2">
 <h4>Place programs below in order of preference</h4>
  <ol class="dd-list dd-placeholder">
   <li class="dd-item" data-id="17">
   <div class="dd-handle">Health Sciences Advisor</div>
  </li>
 </ol> 
</div>

And the original list and the output to the second container are output as serialized json data in textareas like this:

 Serialised Output (per list)
 <textarea id="nestable-output"></textarea>
 <textarea id="nestable2-output" name="nestable2-output"></textarea>

Again no real issue. The textareas will be changed to hidden inputs later.Except that sometimes when i drag a list item from the left column to the right the value doesn't update. here is a link to the jquery.nestable.js

and here is the script in the form:

$(document).ready(function()
{
var updateOutput = function(e)
{
    var list   = e.length ? e : $(e.target),
        output = list.data('output');
    if (window.JSON) {
        output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
    } else {
        output.val('JSON browser support required for this application.');
    }
};
// activate Nestable for list 1
$('#nestable').nestable({
    group: 1
})
.on('change', updateOutput);
// activate Nestable for list 2
$('#nestable2').nestable({
    group: 1
})
.on('change', updateOutput);
// output initial serialised data
$('#nestable2').attr('data-id', 'newvalue');
$('#nestable2').data('id', 'newvalue');

updateOutput($('#nestable').data('output', $('#nestable-output')));

updateOutput($('#nestable2').data('output', $('#nestable2-output')));

});

It only fails sometimes. then if i re-order the list in the second container it updates, but won't update any new items until i re-order again. Any help is greatly appreciated.

---

I found the answer. The issue was in the jquery.nestable.js file around line 475-ish is this:

$(this).data("nestable-id", new Date().getTime());

on faster machines it seems there wasn't enough time in milliseconds for the script to see a change had taken place. Replaced with this:

$(this).data("nestable-id", Math.round(Math.random() * Math.pow(10, 16)));

Any generation of a random number it seems would do, so this answer isn't the only way it could be done.

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