Why is this so different

I have a lot of articles on AC that have like 15-30 page views but 0 "estimated page views" I could understand if all the views were coming from me or something but none of them are? Why arn't they giving me credit for my page views?

It's weird because some of my articles might have 25 page views and 25 estimated page views too. And some are like 20 page views and 4 estimated page views. Whats going on here?

Estimated Page Views are for the current payout cycle. If your article has not been viewed at all since the last time there was a payout then you get zero EPV. The article where you have 25 page views and 25 estimated page views is because all the views on that content were seen since the last payout time. For example, I can have an article with 3000 ALL TIME PAGE VIEWS but those are over time. My Estimated Page Views maybe only be about 250.