Looks like you're in a small and brief experiment (.3% of viewers for a few weeks) so you're seeing auto-generated thumbnails instead of custom thumbs. This is part of an effort to test/improve auto-generated thumbnails for the many creators that use them: https://goo.gl/A7oDmr
Hmm, to help with the issue better, mind sharing screenshots? Keep us posted.
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Thanks for sharing info. Does this happen across devices? Have you tried clearing your browser's cache and cookies? If not, here's how: https://goo.gl/dwzcyo . Let us know if this helps.
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