We'd like to help. Have you tried clearing the browser's cache & cookies to see if that fixes the issue? Here's how: https://goo.gl/e2dYZt . Also, try using Incognito mode to check if that makes any difference. Keep us posted.
Incognito mode is available on desktop browsers as well. Also, please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . You may not get a response, but we do review all of the feedback and use it to investigate & fix issues! Thanks.