Nothing built into mojoportal is generating a link like that. Possibly some custom javascript could be making a link like that or it could have been created in the content by a site editor but technically there doesn't have to be a link for a web request. There are lots of web bots that will make up strange urls trying to poke at your site to cause errors. If there is a bad link in your site google webmaster tools may be able to help you find it.