George has an issue with Siri repeating itself seven or eight times when he uses Siri to set alarms. Leo says he may want to try rebooting the iPhone. It should be rebooted every once in awhile to clear things out. He could also do a hard reset by pressing and holding the on/off button and the home button until the Apple logo appears. The worst case scenario is that he'll need to backup his iPhone and then do a DFU recovery (device firmware update). It's rather complicated to do, so he should consult iMore's step by step guide at iMore.com.
ScooterX in the chatroom says that there is a known bug about this and a discussion about it at discussions.apple.com.