Hi!

The subscription type "new replies to my comments" sends notification for every reply on any comment in the current post, not only replies to the own comments. There is no check, if the parent comment is from the notified subscriber in WpdiscuzHelperEmail->notifyAllCommentSubscribers();

for now, I fixed this by adding a filter to wpdiscuz_email_notification

public function fixWpDiscuzAllCommentNotification($origResult, $emailData, $comment) {
        $wpDiscuzDb = new \WpdiscuzDBManager();
        $subscription = $wpDiscuzDb->hasSubscription($comment->comment_post_ID, $emailData["email"]);
        if ((count($subscription) > 0) && ($subscription["type"] == $wpDiscuzDb::SUBSCRIPTION_ALL_COMMENT)) {
            if ($comment->comment_parent > 0) {
                $parentComment = get_comment($comment->comment_parent);
                if ($parentComment->comment_author_email == $emailData["email"]) {
                    return true;
                }
            }
            return false;
        } else
            return $origResult;
    }