Drag and drop not working in mobile #25

The component behaves well on desktop. But using Chrome's inspector to toggle the device view (or on a real mobile device), it is not possible to drag and drop list items around with Polymer Sortable.

Any idea what the issue is? What can be done to get past this?

Here is a snippet of the code.

<div id="test">
    <sortable-js id="test-data">
        <template is="dom-repeat" items="[[data]]"> 
            <div>[[item]]</div>
        </template>
    </sortable-js>
</div>