explorador - 9:09 pm on May 27, 2013 (gmt 0)
1. The ad targeting totally sucks on my sites
2. The ad serving is so slow it is unreal, many times nothing appears
Now I know why I see such discrepancies and data loss.
That explains a lot.
BTW, my stats show growing mobile traffic, but many won't display ads, a lot of people are using Opera Mini (I use it myself on my phone and on my tablet) no Adsense there.