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The Adsense FAQ says that the two will not match and to determine the actual amount, I should check the aggregate.. which when checked, reflects the amount originally shown, which is less than 1/2 of the total by channels. Visits are up, clicks are up, but suddenly, with only the channels added, the earnings shown has fallen dramatically.
Today I killed the channels and went back to the way it used to be. By only adding channel descriptions and adding the number to google_ad_channel ="number here";.... can it screw things up that bad?
On the other hand, there was a long debate here about making more money by removing channels. Maybe someone can point you to it.