I don't think you should be worried about anything because of this 2nd fingerprinting. Normally fingerprints are good for 15 months, but immigration officer can request another fingerprint-clearance as it may deem appropriate to the officer at the time of finalizing a case. It's the discretion of the officer as provided in the law. However, most officers don't request 2nd Fingerprinting-clearance if the first one is still under 15 months timeframe.
Just hope and pray that you don't get trapped in Name Check game because anyone can get trapped in it regardless of their fingerprints were cleared before. It could also be possible that you might soon get Oath notice in the mail because USCIS is notoriously known for making such a mistake. For example, I've often witnessed over here in the past that many people received another Oath letter AFTER many months later of them being a US citizen. So, just don't worry about it. Besides, you don't have any other choice at this point than just doing what they are asking you.
Good luck....