Same here I just came to put a post about it and how can DP members not have spotted such a thing. Thats why I love DP so much
I'm really hoping this is a temporary glitch, I only have a few channels (under 10) and it's difficult to see quickly how they're doing... I can only imagine how confusing it would make the stats for larger publishers.
It looks like Google is working on this but it may take "weeks" to fix it. The AdSense person in the Google AdSense Group said this" http://www.jensense.com/archives/2007/12/adsense_report.html
At least you received an answer from Google. I didn't. I hope they really intend to fix it. Those of you who haven't sent a note to Google, do it. The more notes they receive, the more they'll understand the importance of the problem.