I just made 2 comments on both of the pages you linked to and the comments are different for each page. I'm not sure what you're seeing, but can you put a comment on one page so we can see it appear on both?
Also, you look to have another extension on your site that is re-including the Facebook Javascript library. While I doubt that's causing this current problem, that may cause other conflicts. We'd highly recommend you disable the Facebook integration in whatever other extension you have it enabled in... possibly JomSocial?
Thanks,
Alex