misbehaving in the supermarket

SELECT * FROM gallery2 WHERE topic_id="1642666" UNION SELECT * FROM gallery2 WHERE topic_id="1289512" UNION SELECT * FROM gallery2 WHERE topic_id="1086397" UNION SELECT * FROM gallery2 WHERE topic_id="1530099" UNION SELECT * FROM gallery2 WHERE topic_id="1076520" UNION SELECT * FROM gallery2 WHERE topic_id="774823" UNION SELECT * FROM gallery2 WHERE topic_id="99688" UNION SELECT * FROM gallery2 WHERE topic_id="1201752" UNION SELECT * FROM gallery2 WHERE topic_id="1012640" UNION SELECT * FROM gallery2 WHERE topic_id="830911" UNION SELECT * FROM gallery2 WHERE topic_id="1645631" UNION SELECT * FROM gallery2 WHERE topic_id="1742049" UNION SELECT * FROM gallery2 WHERE topic_id="420717" UNION SELECT * FROM gallery2 WHERE topic_id="92389" UNION SELECT * FROM gallery2 WHERE topic_id="733841" UNION SELECT * FROM gallery2 WHERE topic_id="433796"