Good question! Realtime data is estimated and meant to provide general guidance on potential view activity, so you may see discrepancies in realtime vs watch page or public views: https://yt.be/help/84s5 . Hope this helps clarify.
@TeamYouTube why are some of my analytics delayed for 2 days. Revenue, Audience analytics, and number of times playlists were viewed are delayed. Is it a bug that’s getting fixed or is it something else? 
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My channel is blowing up at the moment, here’s a screenshot of the problems I’m experiencing with my revenue. The views are up to date but revenue is delayed.pic.twitter.com/4VgFBV8X4M
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