I think you've got the Sort by Title and Sort by Author 'inverted'
IMO the selector text should show the sort value (i.e BookId, Author, Title or Snippet) - it always displays the Title.
In Entity libraries (chaley calls them meta-meta libraries) there is probably only one book per Entity to act as the placeholder for the Entity's metadata. I prefer to use "Placeholder" as the title, rather than leaving it empty and seeing "Unknown".
Having to set the sort sequence every time NV is used is a pain, ideally it should be by column in the Options panel e.g.
Idle thought - should NV be a separate plugin.
BR