I have four different channels (so, as sites). It seems that something is wrong with channel stats. Last time I've checked: Any suggestion? Thanks
Google told me when I complained about something similar that the 'live stats' aren't accurate. They only claim accuracy after 24 hours (not that my problem was solved after 24 hours, but well). I've never seen them make mistakes in the total money earned though, so that they do in your case (even temporarily) is weird. Still, this sort of thing is nothing to worry about.
Yea, I have often found the stats can be delayed, along with the clicks. Although,. one problem I had was one of my ad blocks did not have a channel assigned to it.