When you reset your Kindle the clock loses its setting. The Kindle needs to talk to Amazon's servers in order to correctly set the clock. The Kindle allows you to set the time locally on the Kindle itself, but not the date; the date can only be set when the Kindle talks to Amazon's servers, and hence the "sort by recent" won't work until you do this. You'll need to open the book again before it will get the correct timestamp and appear in the correct place in the "recent" list.
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