Some of my books have their reading navigation completely frozen like this (pic). I was on a new chapter, but the toolbar got stuck on the title of the first chapter.
This problem only occurs on file which were originally epub then got converted to azw3. Files that were azw3 from the beginning or got converted to other formats (such as mobi) didn't encounter the same bug.
What changes should I make in the file to fix this?
I'm using calibre to convert the books.