I am starting to see a pattern with Adsense and Adwords. Adwords charges me for clicks that never make it to my landing page - according to my stats. Adsense does not report or pay for 40 - 60% of actual clicks - according to my stats. So let's see, charge the advertiser for clicks that never actually took a user to the landing page, and don't pay the publisher that provided the ad space for the click that they charged the advertiser for. That's a really good way to make money if you are a crook. Have you noticed this happening?
Time to change your stats or simply stop looking at it and only rely on what adwords charges you and adsense pays you, life's suddenly became easier!