Sorry if this has already been posted but a quick glance and i didnt see it. For the gif I was scrolling through fast to see it occur but it has happened enough with organic usage I felt I needed to post. I checked two post from the video and its not reposted content. Upvoting one upvoted both, both have identical comments.
I'm not sure if this is the same issue, but often, as I'm scrolling through comments on a post, the comments will start over and repeat from the beginning. It'll continue as long as I keep scrolling, too. I never can make it to the end of the comments, as the list just keeps repeating over and over.