At our FAQ there is an entry displaying "double" in the top of the top 10.
check it at http://www.webyog.com/faq/
It is the two ones at the top. It has become quite a "google hit"
There is only one record in the database with these data, but it is in two different sub-categories of the same main category. I think this is a small bug with the code handling of sub-categories. I don't think it would occur with records in two different main categories.