Function load more reloads previous comments

My post have many comment, I want using load more button instead of using pagination.
Mean: when I click button load more to load older comment but still load duplicate comment, click load more button again, still load same comment.
See this video: https://youtu.be/d5EVmYafFnk
My setting in Comment Thread Displaying:

View post on imgur.com

All post have comment same error, I only add the sample page.

• This topic was modified 4 years, 2 months ago by locha9066.
• This topic was modified 4 years, 2 months ago by locha9066.

The page I need help with: [log in to see the link]