Maybe one size too small?

SELECT * FROM gallery2 WHERE topic_id="1608308" UNION SELECT * FROM gallery2 WHERE topic_id="1514626" UNION SELECT * FROM gallery2 WHERE topic_id="298820" UNION SELECT * FROM gallery2 WHERE topic_id="1331408" UNION SELECT * FROM gallery2 WHERE topic_id="29196" UNION SELECT * FROM gallery2 WHERE topic_id="853423" UNION SELECT * FROM gallery2 WHERE topic_id="406013" UNION SELECT * FROM gallery2 WHERE topic_id="445242" UNION SELECT * FROM gallery2 WHERE topic_id="1555875" UNION SELECT * FROM gallery2 WHERE topic_id="1531440" UNION SELECT * FROM gallery2 WHERE topic_id="419923" UNION SELECT * FROM gallery2 WHERE topic_id="1269140" UNION SELECT * FROM gallery2 WHERE topic_id="1385414" UNION SELECT * FROM gallery2 WHERE topic_id="1317682" UNION SELECT * FROM gallery2 WHERE topic_id="252810" UNION SELECT * FROM gallery2 WHERE topic_id="714221"