Andylew - 10:02 am on Jun 1, 2011 (gmt 0)

This is as previously noted a cpanel 'problem' it is discussed all over the web that when an addon domain is created it also creates a sub domain under the master domain for that cpanel account. I belive there is a technical reason for this that dates back to the very early days of cpanel which hasnt ever been re-worked in later releases.