Is this Click Fraud?

Phantom clicks showing in AdWords

[cohwill]

We are running a small AdWords campaign for a client and I am starting to notice that there are more clicks showing up in the AdWords reports than there are actually showing on the weblogs.

The ads are running on both Google's search results and their content network. From 3/1/07 to 3/28/07, the Adword report claims that there were a total of 190 clicks, yet the same time period on the SmarterStats program shows only 10 clicks from the pagead2.googlesyndication...(AdWords ad).

Can anyone explain this to me?

[BDuns]

We have been seeing the same problem, where the SEM campaigns are showing more clicks than our in-house tracking system. The only thing we can think is that our in-house software is tracking UNIQUE clicks, while the search engine (of course) is charging for every click...minus whatever they define as "invalid clicks."