As fellow users on this board we do not have access to that kind of information. You'll need to open a support ticket with OpenDNS for them to look into it.
In the meantime you should do a thorough scan of your website and server (you might need to contact your webhost for part of that) and take a close look at any third party content on the website, including such things as links, content (such as videos) that is actually hosted on another site, scripts, or ads.
