I don't know how you can say that. The Latest Member block is not default vbulletin. The Basic Information block with a list of the usergroups is not default vBulletin. You added both of those blocks. Somewhere in the one, you seem to have chosen some classes perhaps that add a semi-colon to the end of the line. If I recall correctly, if you use <dt> then you will get a semi-colon automatically put afterwards in anticipation of the <dd> you are supposed to then have.
<dl>
<dt style="padding-right:5px"><dd>{vb:rawphrase welcome_to_our_newest_member_x, {vb:link member, {vb:raw newuserinfo}}, {vb:raw newuserinfo.username}}. Be sure to make an <a href="http://www.nbadimensions.net/forums/forumdisplay.php?13-Introductions-Forum">introduction</a> and establish yourself with the fans.</dt>
</dl>