Thread:Project:Support desk/Citation Template adding an extra link?

I'm using the same citation template that wikipedia uses, but whenever I try to cite something that involves a hyperlink, it gives me the link twice. For example, say I'm trying to cite an article called "How to Groom Cats" and the hyperlink is http://www.cats.com/grooming.html, using the template it'll give me something like this:

Jane, Smith (December 4, 2012). "How to Groom Cats". http://www.cats.com/grooming.html. Retrieved December 11, 2012.

The code is exactly the same as the original template on wikipedia, so I'm not entirely sure what's wrong?