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I know this is perhaps stating the obvious, but you should check all the places where you've put your AdSense code and make sure there aren't any without any channels.
Once in a while I do see that my "AdSense for content" total doesn't match the sum of the individual channels, but later on that info is synced properly. For this issue, you could also try clearing your google.com cookies and logging back in to the AdSense website to fix it.
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