Click reported in adsense performance reports?

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I am just starting out with adsense and I am having some trouble understanding a certain part of the performance reports. When I head into the reports I am put into "overview" tab and it shows me I have 100 clicks, however when I click on the tab that says "clicks" it says I only have 20. I made sure they are for the same time frame which is all time. Can anyone help me with this? Also I have had 30,000 pageviews so far and only made $20. Is that usual because it seems very low to me, especially with how much I have made on affiliates. Thank you.

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