jQueryUI Selectables Scrolling Bug

HTML

<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.11.4/themes/black-tie/jquery-ui.css">
<div id="parent">
    <ol id="selectable">
        <li class="ui-widget-content">Item 1</li>
        <li class="ui-widget-content">Item 2</li>
        <li class="ui-widget-content">Item 3</li>
        <li class="ui-widget-content">Item 4</li>
        <li class="ui-widget-content">Item 5</li>
        <li class="ui-widget-content">Item 6</li>
        <li class="ui-widget-content">Item 7 </li>
        <li class="ui-widget-content">Item 8 </li>
        <li class="ui-widget-content">Item 9 </li>
        <li class="ui-widget-content">Item 10</li>
        <li class="ui-widget-content">Item 11</li>
        <li class="ui-widget-content">Item 12</li>
        <li class="ui-widget-content">Item 13</li>
        <li class="ui-widget-content">Item 14</li>
        <li class="ui-widget-content">Item 15</li>
        <li class="ui-widget-content">Item 16</li>
        <li class="ui-widget-content">Item 17</li>
        <li class="ui-widget-content">Item 18</li>
        <li class="ui-widget-content">Item 19</li>
        <li class="ui-widget-content">Item 20</li>
        <li class="ui-widget-content">Item 21</li>
        <li class="ui-widget-content">Item 22</li>
        <li class="ui-widget-content">Item 23</li>
        <li class="ui-widget-content">Item 24</li>
        <li class="ui-widget-content">Item 25</li>
        <li class="ui-widget-content">Item 26</li>
        <li class="ui-widget-content">Item 27</li>
        <li class="ui-widget-content">Item 28</li>
        <li class="ui-widget-content">Item 29</li>
        <li class="ui-widget-content">Item 30</li>
        <li class="ui-widget-content">Item 31</li>
        <li class="ui-widget-content">Item 32</li>
        <li class="ui-widget-content">Item 33</li>
    </ol>
</div>

CSS

#parent { overflow:auto; height: 300px; }
#selectable .ui-selecting { background: #FECA40; }
#selectable .ui-selected { background: #F39814; color: white; }
#selectable { list-style-type: none; margin: 0; padding: 0; width: 60%; }
#selectable li { margin: 3px; padding: 0.4em; font-size: 1.4em; height: 18px; }

JavaScript

$("#selectable").selectable({autoRefresh: false});