Aura H2O2 Ghost authors on new H2O2

Hi guys,

on my brandnew H2O2 i have some ghost-authors. This means in the list of authors they appear but when i click on them there is no book. So i cant delete them. I have to say that i used the "hack" to avoid have to register my kobo, so i deleted the first line of the user-table in the KoboReader.sqlite and added a new one without content. On some other site i read that this might caused the appereance of this ghost-authors.

Does anyone here have an idea, how i can remove them? I am not a fan of this "register-force" which means i would prefer not to reset the reader and then just register normaly.

Thanks in advance,
Mathias