The post in this thread by Corby which explains what the servers are doing when they sync might help:
https://www.mobileread.com/forums/sho...d.php?t=125755, specifically this bit
Quote:
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Additionally, there is a "finished" and a "closed" status on books, which is stored locally, but that status is not synced. When you finish a book on a device, it will reset the bookmark to the first page. So if you sync to a new device, that book will end up being new and unread. This is something we are working on.
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