How should I fix it? It's happening a lot. Does filtering the competetive websites help? Please advice.
mine go up and down as well, but my suggestion is to focus on getting more visitors, in the long run this is going to bring you the most money
Pfft... I get at least 12 clicks per day on one ad and i've never recieved more than 9 cents combined. Its just daylight robbery, i'm not surprised people are looking to move away from Adsense. Its theft, plain and simple.
It's not theft. What happening is your probably getting a bunch of clicks from the same user and they are not counting it.
i think this fron youe content for your site and Keywords... i know some people make from 5 cliks more than 10 $... so you can see all programs and seller about adsense keywords.