Apologies for the double post but I read your post in the 650 forum and I would like to offer 2 suggestions related to this.
1) Skip the OverDrive app. It hasn't been updated in years. Why is this an issue? It is because it's kind of annoying. The app randomly crashes half of the time and you lose your place in the book. It would take you back to the place you was in when you last opened the app, which sucks. Also if you hit the back button by accident on the navigation bar, it can sometimes take you back in the book.
2) When reading books in Edge, change your theme to dark when you open a book. It's better for your screen. You can do that by tapping the icon next to the "A". Even if you close the book by accident, because of syncing, it will take you back to where you were when you reopen it.