Have they actually expired, or just say they are going to.
ADE2.0 stupidly decides to quote expiry in weeks, and rounds it down.
So 1 minute after you have borrowed, and have 2 weeks, 6 days, 23 hours and 59 minutes left, it says 2 weeks.
I think it will actually last the correct time.
If you ask the Nook it will probably tell you the loan expiry correctly.
Also, if you ask for detailed info on the book (ctrl-I), ADE probably tells you correctly.