u/BlueLanternCorp63

I have a Kobo Libra and using Calibre to copy over books in a series. There's 14 books in the series. The issue I'm having is anytime I try to copy book 11-14 over, Calibre swaps out books 1-4 respectively and vice versa. Example: When I copy over book 13, it replaces book 3. When I try to add book 3 back to the device, it swaps with book 13.

Has anyone encountered this issue before and know of a solution?