Catherine here from KindleLendingClub.com - You've put your finger on one of the pain points for our users :) A challenge of developing a community platform around Kindle lending is that there is no straightforward way for us to hook into Amazon's Kindle lending system to determine whether a loan did or did not actually occur. We're trying to work around this by asking lenders to "confirm" the loan at the time they do it, but it's a necessarily imperfect workaround that we're refining in our next iteration. If for some reason a lender doesn't click to confirm the loan, the lender's book loan offer remains live and triggers reminders when there are other borrowers for the title.
To stop lending request reminders for a particular title, you can delete the loan offer from your profile: http://www.kindlelendingclub.com/myprofile.htm
If you need help or have feedback, we're just an email away: info@kindlelendingclub.com