Pre-recorded? There is an inherent delay of some seconds on any feed that is streams. Remember, you aren't connecting to the actual computer that is streaming the audio but rather a relay server. Network delays / latency as well as the time it takes to convert the analog audio into a digital medium and send it up to the relay will produce a slight delay. If, for instance, I'm using my internet connection heavily and am providing a feed to RR, the listener would notice more of a delay than they would notice listening to a stream provided over an uninhibited connection.
If you are saying that the audio stream is actually repeating the same traffic ovver and over, then that is a separate issue and I'm unsure what causes it. At times I've lost connection to a feed because my internet link went down, and then when the link came back up my player was playing audio that I had already heard before. You should close your audio player, open it, and attempt to listen again and see if you are still experiencing the problem. This may also happen if the feed provider's link to the central audio servers goes down while you are listening to the feed.
Mike