Thanks for reaching out. This happens when YouTube is aware of an issue with the Analytics and is working on it. You'll see the updated count and the banner disappear when the issue is fixed. Hope this helps clarify.
@TeamYouTube
Dear Youtube Team, It Almost 3 Months That Iam Facing A Problem In My Analysis That Data Is Under Reported For Some Dates (19 Dec 2018) As Shown In The Given ScreenShot So Please Solve My Problem As Soon As Possible.
Thank You.pic.twitter.com/UOZiju9KsL
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