I think it is a bug, I see the same stupid reports that tell me that every single page of my site is in position 1.0 and I wonder 1.0 of what? It certainly is not in position 1.0 of anything I can find. And I see the same useless information for several sites. I still wonder why they have us verify sites and select a targeted location only so they can feature your site on the other side of the world. When I apply filters for location: US to some traffic reports it drops from thousands of impressions to less than 10 with no indication of why. There is a lot of useless stuff in GWT. I still look there because occasionally I will find a useful gem of information. Almost never though.