Tewiki Talk page redirected, while corresponding content page is not

SQL

USE tewiki_p;
SELECT 
    s.page_namespace AS subject_ns,
	t.page_namespace AS talk_ns,
    s.page_title AS title, 
    pp_propname<=>'disambiguation' AS disambig
FROM 
	`page` t 
	INNER JOIN `page` s ON (s.page_namespace=(t.page_namespace-1) AND s.page_title=t.page_title) 
	LEFT JOIN page_props ON (s.page_id=pp_page AND pp_propname='disambiguation')
WHERE
	t.page_namespace != 3 AND	# exclude user talk
    (t.page_namespace = 0 OR t.page_title NOT REGEXP '/') AND
    t.page_is_redirect=1 AND
    (t.page_namespace MOD 2)=1 AND
    s.page_is_redirect=0
ORDER BY s.page_title

SQL

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