The Books window (set to 'All Library') shows two copies of every book. Any actions (such as Delete) apply to both copies. Everything else works as expected so it seems just to be a display bug...
Sample of Books scereen below:
The Books window (set to 'All Library') shows two copies of every book. Any actions (such as Delete) apply to both copies. Everything else works as expected so it seems just to be a display bug...
Sample of Books scereen below: