Bug in Powered By text?

Has anyone noticed a problem with the way the Powered By footer displays? Ours displays like

Adaptavist Theme Builder (3.1.1) Powered by Atlassian Confluence 1109, the Enterprise Wiki.

The HTML code that's being generated is the following:

<tr>
   <td id="poweredby" class="poweredby" align="center"><div>
      <a href="https://www.adaptavist.com/">Adaptavist Theme Builder</a> (3.1.1) Powered by <a href="2.7" class="smalltext">Atlassian Confluence</a> 1109, the <a href="2.7" class="smalltext">Enterprise Wiki</a>.</div>
   </td>
</tr>

I'm pretty sure 2.7 should be displayed as the version number and shouldn't be used as the URL, but I'm not aware of a way to view or change the text. I've followed the instructions on making a custom footer and hiding the powered by footer, but I'd like the Confluence and Theme Builder versions to display.

Any ideas?