It's the way you've installed them, you need to look at a standard template (default) and see that the <td>'s will amount to 3 or 4 for accross that section, it looks like you only have one so you need to set the <td width="100%"> but if you have other TDs in there they will make up some of the width, anyway this may help you
https://www.vbulletin.com/forum/show...m-List-Columns but do check a default template first.