We'd like to help. Could you try deleting and re-uploading the thumbnail to see if that makes a difference? Let us know.
@TeamYouTube any reason why some of my thumbnails aren't displaying on my channel properly? Some have defaulted back to the middle of the video.pic.twitter.com/mktrozQvdY
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I've tried but nothing has changed so far. If it helps narrow things down the thumbnail seemed fine until the video premiered. In my videos tab it's fine but on my main channel home screen it's reverted to the default still
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