Does it still happen if you change one letter or symbol in the signature?
(This isn't a big deal. It doesn't seem to have the same problem when I click on your signature [there's no link]. It doesn't compromise the website. We might just let it alone, but I don't mind trying to tinker with it with you. If you want, I can go in there myself too, but I don't like poking around in other people's profiles unless they green light me to.)