40k views on a video and i earned $0.22 , why ? [ Fully Monetized ]

Here : https://ibb.co/hJpnzv also .. 37k views video was 30~ secs long and 23k views video was 8 secs long .. and why did an 8 second video with less views / watch time made more revenue ? here : https://ibb.co/hFSeCF