[Bug] Duplicate posts being shown on "Show Me More"

I clicked "Show Me More" while viewing a thread, and I was surprised to see Pendragon had double posted. I also saw there was more to be shown. Imagine my surprise when he had quadruple posted.

This happens whenever I click "Show Me More", the new posts come in twice.

Browser: Internet Explorer 11 Beta
OS: Windows 8.1 Beta