I wonder what is going on? I've put statcounter only on most popular pages and it barely controls 40% of my traffic. Yet, it shows 16 clicks in exit links and adsense only shows 1. I understand that not all clicks may be valid , yet they are legitimate clicks, i've never broken any TOS. Virtually all my traffic is from google search , these 16 clicks came from at least 12 first-time visitors.
have you use google analytics ? if so, integrate it with adsense. this is the only tracking result you can trust when compare to adsense.
in my adsense it says-- go to your analytics account-- in analytics i have never had any adsense data i dont remember if i ever integrated them, but i do not see any option to do so right now
Adsense consider other as invalid click or the visitor mistakenly click on the ads and immediately close it
Maybe they were considered invalid clicks by Google Adsense, integrate Analytics to get proper results
Maybe you need to get more legitimate clicks from actual visitors. I spend money on advertising such as media traffic and make back my money 400% + each and every time. You should try that type of advertising and easily make your money back.