your recordse on the update page is filtered on the autoNum querystring variable, this variable does not exist.
instead you should use the WADA_Insert_mre session variable that is created by the insert record behavior.
You should also use that session variable in the Update record behavior.
when you added the error reporting code, you left a blnk line:
<?php require_once('../../Connections/mreConn.php'); ?>
this blank line should be removed.