http://www.adsensedecorator.com/adsense-earnings-without-clicks/
Why is my google adsense earnings rise so dramatically without any clicks?
Since my first adsense payment I had 111 million deferred dollars for my next payment, but all of a sudden he jumped on the 213 million out of nowhere, and no one was clicking ads in my reports. and since my first payment (my payment I was talking to the begging of this) in my history report tab has jumped to $ 121 $ 140. I mind you, I am just a YouTube partner, I do not get paid via youtube right now. I was wondering what the problem might be due to pre-roll ads? I did a number of my videos, but if so, then why are they so long to update the gains?
Google will give you an estimate on earnings. This may change at any time. The increase is not large enough to worry about anything questionable passes. I take the extra you earned 
Monthly Adsense Earnings Case Study – Part 1 of 2