Hi there, please go here and try to reply. Insert this text: <span class="oo-ui-iconWidget oo-ui-iconElement-icon oo-ui-icon-userAdd"> </span> and publish the comment. Then you will probably see the wrong higliting. You can also do it by the new Discussion tool.
And another bug, please see category box. I use Hotcat (see preferences) and there are a lot of buttons after a single reply (see image).