That seems to be due to your usergroup markup code, you have a mixture of divs, spans and font tags, for example ;
HTML Code:
<a rel="nofollow" href='member.php?u=111' title='03:12 PM' ><span style="font-weight: bold;">Headlackey</span></a>,
<a rel="nofollow" href='member.php?u=88' title='04:36 AM' ><div style=width:50%; font-size:14pt; color:white; >hypr69</span></a>,
<a rel="nofollow" href='member.php?u=2' title='08:22 AM' ><b><font color="red">Incrediblehawk</b></font></a>,