Update..
OK, we found the problem. One of our database servers is having some sort of problem. Basically anyone's stats on this server are "stuck" between the place we record them and where you view them. This problem effected less than 10% of our webmasters.
Our current monitoring systems didn't detect the problem, they reported everything as running smoothly. We are going to implement an additional monitoring mechanism to prevent this from happening in the future.
Again, I'm sincerely sorry for the inconvenience.
-KC
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