We'd like to help. Have you tried re uploading the thumbnail to see if that resolves the issue? Let us know.
@TeamYouTube Why is the 5 seconds thumbnail preview gif stretched? This has been happening for me at least 60 times now.
(By the way, That screenshot was taken on October 12 2018.)pic.twitter.com/ANfQMW6LCP
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Actually that wasn't my video, That was DanTDM's video.
End of conversation
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