Adsense is great, and Google does a great job with their reporting. If you want to make sure your Adsense is accurate, you need to tweak your site.
Since you are an administrator, you spend a lot of time on your site, and Adsense is serving you ads. To eliminate any chance of a false ad impression, configure your site to not serve ads to the administrator.
In our previous posting on adding Adsense to your Drupal site, we demonstrated how to add Adsense via a block.