Hey there; when viewing any page on the site, there's a notice on the top of the screen claiming "Your nickname contains invalid characters. Please, change it".

I don't have anything weird in my nickname, you can see it yourself!...I even tried resubmitting the same nickname, which results in a message stating "The nickname you suggested does not differ from your actual nickname".

Is there any way I can get this flag removed, or have I indeed done something wrong with my nickname?