Responsive not transferring DOM elements to collapsible area

Zxurian

Desktop view: http://i.imgur.com/PlmUcVy.png
1st Breakpoint view: http://i.imgur.com/qrpsWox.png

Where the contributor/s are, those two dom elements should have been transferred as is, however instead I get [object Object]

Original cell data (prettified here, but minified when live):

<td class=" booklistContributors" style="">
    <a data-identifier="undefined" class="stamp stamp-contributor">
        <span class="stamp-left"><i class="icon-user"></i></span>
        <span class="stamp-right">J.K. Rowling</span>
    </a>
    <a data-identifier="undefined" class="stamp stamp-contributor">
        <span class="stamp-left"><i class="icon-user"></i></span>
        <span class="stamp-right">Jack Thorne</span>
    </a>
</td>