I have 6 entries for the same title in the ADE title list. All have the same date and time added. All but one are blank in the "Last Read" column. On my computer I have only 1 epub file for this title. Why do I have multiple entries for the same title? If I delete all entries except for the one that has a date and time in the Last Read column will that be okay -- will I still be able to access the book?