Proper Nested Search using Javascript

I am using list.js to search, sort and filter my menu items. I am having a problem using search function upon nested <ul>'s and couldn't avoid it.

The problem is when I search for a text in sub <ul> element, it returns the whole <li>'s in the sub <ul>.

Is there anything I am missing?

JSFiddle: https://jsfiddle.net/7ukgqmsp/

Here is a sample code;

  var options = {
      valueNames: ['demo-class']
  };
  var userList = new List('test', options);

<script src="https://cdnjs.cloudflare.com/ajax/libs/list.js/1.2.0/list.min.js"></script>
<div id="test">
  <input class="search" placeholder="Search" />
  <ul class="list">
    <li>
      <a class="demo-class" href="#" title="1">1</a>
    </li>
    <li>
      <a class="demo-class" href="#" title="2">2</a>
    </li>
    <ul class="list">
      <li>
        <a class="demo-class" href="#" title="3">3</a>
      </li>
      <li>
        <a class="demo-class" href="#" title="4">4</a>
      </li>
      <li>
        <a class="demo-class" href="#" title="5">5</a>
      </li>
      <li>
        <a class="demo-class" href="#" title="6">6</a>
      </li>
    </ul>
    <li>
      <a class="demo-class" href="#" title="7">7</a>
    </li>
  </ul>
</div>

Solution

As @Sam and @David stated, it was a library issue.

If someone is using or wants to use this library with nested functionality, it's avaliable under project's GitHub page.

Github - List.js with nested functionality

An example usage;

$(function() {
  var options = {
    valueNames: ['searchable'],
    item: '<li><a class="searchable" href="#"></a></li>',
    nestedSearch: true
  };
  var userList = new List('users', options);
})

<div class="service-list">
<div id="users">
  <input class="search" placeholder="Search" />
  <dl class="accordion" data-accordion>
    <dd>
      <div id="panel1" class="content">
        <ul class="list first-level">
          <li>
            <a href="#" class="searchable link-first-level">Card Services Summary</a>
            <ul class="list">
              <li>
                <a class="searchable" href="#">Permanent Access Card</a>
                <ul class="list last-level">
                  <li><a class="searchable" href="#">Apply for new</a></li>
                  <li><a class="searchable" href="#">Apply for replacement</a></li>
                  <li><a class="searchable" href="#">Cancel current</a></li>
                </ul>
              </li>
              <li>
                <a class="searchable" href="#">Permanent Identity Card</a>
                <ul class="list last-level">
                  <li><a class="searchable" href="#">Apply for new</a></li>
                  <li><a class="searchable" href="#">Apply for replacement</a></li>
                  <li><a class="searchable" href="#">Cancel current</a></li>
                </ul>
              <li>
                <a class="searchable" href="#">Temporary Access Card</a>
                <ul class="list last-level">
                  <li><a class="searchable" href="#">Apply for new</a></li>
                  <li><a class="searchable" href="#">Apply for replacement</a></li>
                  <li><a class="searchable" href="#">Cancel current</a></li>
                </ul>
              <li>
                <a class="searchable" href="#">Free Zone Card</a>
                <ul class="list last-level">
                  <li><a class="searchable" href="#">Apply for new</a></li>
                  <li><a class="searchable" href="#">Apply for duplicate</a></li>
                  <li><a class="searchable" href="#">Apply for replacement</a></li>
                  <li><a class="searchable" href="#">Amend current</a></li>
                  <li><a class="searchable" href="#">Cancel current</a></li>
                </ul>
              </li>
            </ul>
          </li>
        </ul>
      </div>
    </dd>
  </dl>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="https://raw.githubusercontent.com/bilalfastian/list.js/feature/nested-search/dist/list.min.js"></script>