62db5789_Known_Issues__Affected_Users
[Current Issue] Books: Restoring or Importing a Book from one Moodle unit into a different Moodle unit imports all Group names associated with the original unit even if the book itself had no associations to these groups. [Status] This issue is currently with Moodle HQ. [Affected Users] 
Teaching staff and Moodle adminstrators using the book resource When restoring or importing a book resource from one unit to another, you should manually delete all unwanted group names that are created during the process.
Known Issues
Affected Users