Some users have reported duplicate comments appearing and I have also seen this issue myself. I believe this is related to the Live Update functionality. We are using the "Always check for new comments and show update buttons" setting. I believe that after the button is pressed, duplicate comments are sometimes displayed. That is, some comments are appearing multiple times. I saw this in the Brave browser, but one of my users saw this in Firefox.
I can try to capture the behavior and send you a screenshot if this is what you are looking for. Otherwise I think I will need to create an account for you on the website, as I believe that Live Update is only working for logged in users? If you would like an account, please email me directly.