First, the new Debating category. I don't know if you have access to the site's main HTML file, or just a program (ACP) that adds categories for you. If you can, you should delete the following code from the section that adds the last category:
<td class="row1" width="46"><img src="/_.gif" height="0" width="46" /></td>
That is what is adding that blank column where the images should be. I have no idea how that happened, but it is very important to fix.
If you can't access the HTML, just move the current topics somewhere else, delete and remake the category, and move the topics back.
Next, I'd like to see some HSpace in the category titles. Right now, they are aligned all the way to the left of the table, with no pixels between the first letter and the table border. I'd use cellpadding or hspace to the code, or just add spaces or to the category title.