There was a bug in the code for email registration. We used to use case insensitive passwords, but I changed the code to use case sensitive passwords. For the email registration script, the conversion was incomplete. It was still converting passwords to lowercase, which it should no longer do. So here is what might have happened. You chose a mixed case or upper case password, and when you entered it, it didn't accept it, because it had been converted into a lowercase password, and passwords are now case-sensitive.
If you check the email it sent you, you should find your password all in lowercase. Enter this as your password instead of what you originally gave as your password, and you should be able to log in. Checking the database, I see you already have two accounts with us: johnnyluken and jhildluke.
In case this does not work, there is also a script for changing your password.