This is a tiny bug on the Data Explorer site. In the user details page, the link href to the user's website is missing the colon in the protocol specifier (e.g.
http//example.org instead of
http://example.org). The link text is displayed correctly.
It was actually producing a link element like the following:
...which your browser interpreted as a link to
http://http//example.org. Either way, not what you wanted.
I'm not entirely sure that the way those attributes are handled at the moment makes the most sense, but for the time being I've gone ahead and made sure that the
http:// is only added when the provided URL doesn't already start with it or