Hey there,
I am really sorry for the delay of this reply as it is a weekend for us here.
Actually that is default behaviour, it will not show those Easysocial group discussion post on the listing page, but it will appear on the 'Group' menu link on the toolbar and this user have to be the group member in order to see it, you can check my attached screenshot below.
If you would like to show these discussion on the recent page, you have to modify some code under this file
JoomlaFolder/administrator/components/com_easydiscuss/models/posts.php
LINE 771 -773
if (!$includeCluster) {
$where[] = "a.`cluster_id` = " . $db->Quote(0);
}
Replace with
//if (!$includeCluster) {
// $where[] = "a.`cluster_id` = " . $db->Quote(0);
//}