I'm very confused by this! We're definitely getting visitors and sales but why the disparity and inability to display the number? All other statistics are being displayed correctly (total visitors) and AdWords is showing the same number of clicks.
I think some one make a fack click on your site because your adsense account banne by google so be careful ok
No, people have been buying things and the only advertising is paid for from Google. I know of more than one friend who's tested the advertising manually and clicked onto the site. It's a statistic problem, somewhere. Thanks for the opinion though.
Best place to ask this question is Google Web-master Forums. Your ads might be banned, get this issue sorted, asap.