I had a book that kept syncing to the end because I accidentally selected the last chapter from the table of contents on my KT when I was trying to page forward. I set my Kindle and my Android Kindle app back to page 1. Both would continuously try and sync to the end. I deleted the book from both and re-downloaded. It still tried to sync to the end.
I had to contact Kindle customer service via online chat and have them reset the furthest page read. I requested that this be a feature users can do themselves but I am going to guess it fell on deaf ears.