Index: bbp-includes/bbp-reply-template.php
--- bbp-includes/bbp-reply-template.php
+++ bbp-includes/bbp-reply-template.php
@@ -84,7 +84,7 @@
 		'post_status'    => $default_post_status,       // Of this status
 		'posts_per_page' => bbp_get_replies_per_page(), // This many
 		'paged'          => bbp_get_paged(),            // On this page
-		'orderby'        => 'date',                     // Sorted by date
+		'orderby'        => 'ID',                       // Sorted by ID
 		'order'          => 'ASC',                      // Oldest to newest
 		's'              => $default_reply_search,      // Maybe search
 	);