Thanks for reaching out. Could you try clearing the browser's cache & cookies to see if that fixes the issue? Here's how: https://goo.gl/nL28uY . Also, have you tried http://youtube.com/new to opt-in to the new design? Let us know how it goes.
That's odd, could you file a feedback report with these steps: https://goo.gl/1ckkO5 ? We review all the feedback sent to us, but YouTube doesn't necessarily respond to every single one. We use the info to identify and fix issues, as well as track requests and make improvements.