@mariaclaudia:
I imported your 2 books into my Calibre, immediately ran ABCH, and the results were perfect. See the attached image from my pc.
[1] Do you have the latest version of ABCH? Perhaps you should use Plugin Updater to install again even if you do.
[2] Are your Calibre> Preferences > Tweaks like those shown in the attached image from my pc? If not, what would they be?
[3] Could you go to
http://sqlitebrowser.org/ to download the "DB Browser for SQLite" and install it. Could you take an image of the authors table within your library's metadata.db file showing at least one of your problem authors? See the image attached for an example. Just "browse"; don't change anything. Be sure to exit the tool when you are finished so it does not lock your metadata.db file.
Thank you.
DaltonST