I'm not sure but the clicks most probably are either invalid, public service ads or less than a cent each.
To day I saw a similar kind of stats in my adsense dashboard. from 3 clicks on ads I received only 7 cents and from 2 clicks on search result I got a big 0.
It can be that the clicks are from country that Google will pay less. You need a lot of websites to make money in Adsense unless your website has high traffic.
Its happened to me every once and a while as well but if you're seeing this all the time I would contact Google just to be sure they don't count these as invalid clicks. Whenever in doubt, I recommend touching base with Google just to be sure.