when i hit left and right arrows while a video is playing to FF or RW the whole page jumps to the comments. [chrome/windows 10]. any ideas on a fix?

======= corection========== left arrow and right arrow jump to top and botom of page not simply the comments. only on youtube, in default view

its not consistent only once after ive left the video play for a while, and then it goes away after it happens until i let it sit for a while again. its hard for me to describe cuz i do not understand what exactly the pattern is. i vaguely remember this happening to me a year ago, but i cant remember what the fix was an i cannot find any answers online. any help would be appreciated.