When I click on "login" from the front page and type in my username & password, I get a "Permission denied." error message. If I need to log in, I have to reset my password, and then I'm logged in.
blogs.perl.org is known to be broken in various ways: https://github.com/blogs-perl-org/blogs.perl.org/issues
Until someone has both the tuits and the inclination to try and fix some of these, the situation isn't going to change, alas.
For what it's worth, this brokenness is not universal. For me the login via MovableType works perfectly fine.
I'm a Perl developer.