I hope you are well today and thank you for your question.
Does it work fine for you using default WordPress Twenty Seventeen theme?
Could you please share me the page URL from your site where it is not displaying correctly so that i can troubleshoot it?
I could confirm it on your shared site.
The theme displays comments counter using default WordPress function get_comments_number so please contact disqus comments system to know whether they display comments count using any other function than this.