When I check out a epub book from my library I see in my Mac and library account that I have two weeks to read the ebook. When I use ADE to move the ebook to my Nook simple touch, I only get one week to read it. This seemed to begin when ADE released an update about mid summer. I have looked for settings to control this, but failed to find any.
Are you sure the loan is really reduced to 1 week, or is it just the way the time is reported?
I seem to remember there used to be a stupidity with some version of ADE, that it reported loans over a week rounded down to the week.
(Doesn't seem to apply to 1.7.2 or 2.0.1; maybe I remembered wrong?)
Thus a 14 day loan will be only 13 days, 23hours, 59 minutes and a few seconds just after it has been fulfilled,
and this was reported as one week.
Maybe there is a similar stupidity with your Nook?