Now that I have List view with Collections, I think I found a bug. If you look at the percentage read at the bottom of what you are reading and then go back to the list of books in that book's Collection. The percentage shown in the Collection display for the book you are reading is always 1% less than what it shows in the book. In other words, the book says 20% and the Collection says 19%. That didn't happening in my last version, 5.14.1.1. I said it was a bug, I didn't say it was a big bug.
It does mess me up since I read 4 books in a circuitous order, 10% at a time for each book. I know, weird, but it works for me to keep my interest up. I've never been one to read a book start to finish. I guess I'll just have to learn to ignore the Collection display.