Audiobooks in Finder Sync, not in iBooks App

Device: MacBook Air Apple M4

Software: macOS Tahoe 26.3

When using the Finder to sync an iPhone 8, a number of books display under the Audiobooks tab that are not in my iBooks app - see imbedded image. Is it possible to fix this so these unselected Audiobooks do not display in the Audiobooks tab?

Note: I used to operate an iMac and migrated the data into my MacBook from the iMac backup and these unselected audiobooks displayed on my MacBook after the migration of data from the backup. I have run a comprehensive search on my MacBook and these files cannot be located.