You need to change the HTML structure of the page that contains multiple comment forms in a way that there is one element that wraps each post and that element needs to have a unique ID.
On your page these containers look like this (the ID unique attribute is missing):
<div class="post-45817 sat_reading_sec type-sat_reading_sec status-publish format-standard hentry">
Next, you need to configure the "Post container selector" options to match all these containers; one option could be:
Hope this helps,