I would say that these files are either Fake or Corrupt.
Are you able to Preview any of these files that you speak of ??
The Network is Loaded with Viruses, Worms, Trojans, Fakes, and Corrupt Files.
Be Very Cautious of things like, bitrates, kb's, as in size, Length, and types.
Stay away from files that are 3462kb's and 5611kb's as these are known to be Viruses.

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thankyou firstly for answering my question, i cannot preview but it does seem to be only on certain things, but if the system is riddled with virus's how come the guys that run the site can't do anything about it.