I'm getting totally confused by the user preferences options in perlbug RT.

I'm trying to change my address from nobull67@gmail.com to nobull@cpan.org but if I enter nobull@cpan.org in the preference field nothing happens when I submit it.

Originally my address was presented as "nobull67 <!-- x --> at gmail.com" but when I entered "nobull <!-- x --> at cpan.org" I was told my address had changed from "nobull67 at gmail.com" to "nobull <!-- x --> at cpan.org" implying it was now really going to try putting the "<!-- x -->" in my address.

Both addresses are registered on my BitCard account. Why can't I just have a pull-down?