lucy24 - 10:13 pm on Nov 4, 2012 (gmt 0)
Most of my spurious #1s come at the bottom of the list-- that's why I never noticed them until I actively looked. That means the ones where both "impressions" and "clicks" are given as simply "<10". But if I scroll down to the bottom of the bottom, I again meet a fistful of bigger numbers. (Bigger in this context means worse.)
g### says that <10 means some number greater than 1. I'm inclined to doubt the >1 part. In the case of impressions it obviously means >0 -- otherwise your list would go on forever :) -- but if your site is as small as mine, any given month will have pages with only one impression and zero clicks.
Here's what I think: When "<10" means 0 clicks, then the page position isn't calculated. It defaults to 1.0. It is up to you to figure out whether "1.0" really means #1 or whether it means, er, something lousy ;)