Headings in IIS log

In the IIS web log of my Windows Server 2008, in between the web activities, there are some header entries in the log files:

#Software: Microsoft Internet Information Services 7.5
#Version: 1.0
#Date: 2012-03-30 04:20:08
#Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip

Shouldn't this heading only appear once in every log file?  Any ideas why it appears many times in a log file?  Thanks.
hoggieeAsked:
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BillAndrasCommented:
The log headers occur anytime IIS is reset, the app pool shuts down and restarts (default is 20 mins without activity) and if you have multiple sites configured with different fields for the log output it will append at the first hit to each site.

Check to see if your app pool is restarting causing these log entries to appear.
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hoggieeAuthor Commented:
Yes.  There were some reset of the application pool, and there are multiple websites created on the same server.  Thanks for the help.
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