Is Google Adsense fraudulent!

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So, I decided to put Google's Adsense ads on the home page of my latest website. According to my website statistics, on 21st March 2009 about about 25 visitors exited my website via these ads. However, the IP address being shown is my own IP address yet I have never clicked on any of those adverts! Obviously, the clicks have not been credited to my account. Anyone else had any experiences like this with Adsense or can explain why this has happened?