Registration calls username "nickname"

When I registered as a user of the forums (http://qt-project.org/member/register), I was asked for my email address, nickname and password. When I attempt to login I’m asked for my username. Every alert new user will think, "hang on a minute, I haven't got a username".

It seems that I the login prompt wants what the registration process called my nickname. I expect a nickname to be non-unique, so cannot be used for login purposes.

I think the registration page should be changed to say username instead of nickname. It might save some new users some confusion.