Why are views disappearing and not counted?

Question

YouTube

Hello, I'm trying to raise the channel, from time to time I try to order advertising on Google ads.
The first problem - I recently noticed that the number of views from Google ads analytics by video does not go to the video itself. Suppose he writes that thanks to advertising, the video gained 5700 views, in fact, in the analytics of YouTube itself, and on the video itself, he writes that there are only 900 views of the video. A similar situation is repeated not for the first time.

The second problem is that a certain number of views are accumulated, then a certain number of views, it is simply cut off, the option with cheating views disappears, because. I don’t use it, I use only Google Ads and social networks for video promotion, i.e. the traffic is essentially clean, YouTube can’t take away the views that it itself cheated on me thanks to google ads. What's wrong?

The third problem is that if you look at the analytics of videos for the last 365 days, then I have 650 hours of views on the channel, but if you go to the monetization section to see how many hours and subscribers I have left before I can turn on monetization, it shows that my the channel has only 155 hours of views, why don't the hours of views go there, or does a very small percentage go there?

Answer 1

1) See the percentage of failures
2) Views that have reached a certain threshold in time, conditionally 20 seconds, are taken into account. and more, look in the terms of the service, for this, by the way, the number of views is rolled back, first everything is considered, then only "real" views are left.
3) Adblock and other non-views of ads in the video are also likely to have a strong impact.
4) Recalculation of hours can be performed not on the fly, but with some delay, which is typical for large services, for example, Facebook does this for sure.