I haven't posted in ages, but just got a private message about the forum update. I noticed my username, which uses non Latin characters, is incorrectly encoded. So pikku nälkä displays as pikku nälkä. I also have to login with pikku nälkä else it won't recognise the username. (As a web dev) I've had this issue before. I noticed you are using UTF-8 as your page's charset, but maybe you should check the template you use to fetch and create the username variable/constant.
No worries, you can go ahead and delete the account as I'm not really active here anymore. I had a quick look around, but couldn't find a way to delete it myself. Stay lucky, folks.