Hi, clearing cache may help but another thing worth trying is manually updating the browser's ad blocker:
Desktop: Go to Settings > Shields > Content filtering and click the “Update lists” button
iOS: Go to Settings > Shields & Privacy > Content Filtering and click the “Update Lists” button
Android: Go to Settings > Brave Shields & privacy > Content filtering and click the “UPDATE” button
After that, reload your YT tabs and see if the issue is fixed.