When I look at the ‘Unread’ button, it says there are 7 unread posts, but when I click on it, it only shows 1. This can be very misleading, and I hope it gets fixed!
(BTW, this also happens to me on the SC2 Forums.)
These types of issues are not Blizzards problem, this forum is for bug reports related specifically for the game, if you want to get this fixed then you have to report it here:
If it ends up as Blizzard related issue then try here as its only category I believe it takes feedback for the site: