Was looking at yesterdays stats, it says that I got 3 clicks, but when I look at my channels I've got set up, 1st channel has 2 clicks, 2nd has 2 clicks, 3rd has 2 clicks, 4th has 1 click, 5th has 1 click, which = 8 clicks! Plus the earnings for all those 8 clicks combined, doesn't = what AdSense has shown me for those 3 clicks up the top.
When I was new I setup a URL channel for the site. Then I wanted to check to see where I got most of my clicks so I created a custom channel. When I check my stats I see clicks on the URL channel and the custom channel. Google tells me that clicks on either of them could be counted twice so I don't get paid for all clicks and at the end of the month it adds up. I am not sure if I can remove all URL channels or not. Maybe I loose clicks doing that. Have asked Google several times but never got any good answer to what to do so I only see (valid) clicks.