That does seem odd. Could you try clearing cache/cookies? Also, try using a different browser or Incognito mode. Let us know if that fixes the issue.
Are you using the updated version of the browser? If yes, send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything & use the details to investigate and fix issues.