I submitted a ticket for the list to remove the site from this illusive 'gambling' tag.
Admins: You can edit your Content Filter settings and add a whitelist, while the listing issue is resolved.
As for cause, bot accounts were adding links in their profile and looked to be using that for spam purposes. I have since turned off the URL profile option to counter this.
Edited by Pic0o, 26 October 2012 - 08:06 AM.