Index: src/bp-blogs/bp-blogs-functions.php
===================================================================
--- src/bp-blogs/bp-blogs-functions.php
+++ src/bp-blogs/bp-blogs-functions.php
@@ -662,6 +662,7 @@
 				$args['filter'] = array(
 					'object'       => $activity_post_object->comments_tracking->component_id,
 					'action'       => $activity_post_object->comments_tracking->action_id,
+					'primary_id'   => get_current_blog_id(),
 					'secondary_id' => implode( ',', $comment_ids ),
 				);