For a test, I'm using Yahoo ads (media.net) since last week. I am wondering to see a big mismatch in reports. I have 3 ad units of adsense, and 2 units of yahoo ads per page. Here's the reports of 2 these ad networks: March 23, 2014 Media.net = 869 AdSense = 158 March 23, 2014 Media.net = 637 AdSense = 119 March 22, 2014 Media.net = 861 AdSense = 166 Is it cheating? or my misunderstanding?
Could be that Adsense isn't showing to all of these visitors, could be that you have too many ad's to load, too many ad's they're all not loading before your visitors leave? Could be numerous possibilities.