seeing double

SELECT * FROM gallery2 WHERE topic_id="1564397" UNION SELECT * FROM gallery2 WHERE topic_id="346890" UNION SELECT * FROM gallery2 WHERE topic_id="1274502" UNION SELECT * FROM gallery2 WHERE topic_id="1455954" UNION SELECT * FROM gallery2 WHERE topic_id="1465911" UNION SELECT * FROM gallery2 WHERE topic_id="1218338" UNION SELECT * FROM gallery2 WHERE topic_id="910988" UNION SELECT * FROM gallery2 WHERE topic_id="786230" UNION SELECT * FROM gallery2 WHERE topic_id="1594222" UNION SELECT * FROM gallery2 WHERE topic_id="1461161" UNION SELECT * FROM gallery2 WHERE topic_id="402638" UNION SELECT * FROM gallery2 WHERE topic_id="1206758" UNION SELECT * FROM gallery2 WHERE topic_id="1732456" UNION SELECT * FROM gallery2 WHERE topic_id="1355158" UNION SELECT * FROM gallery2 WHERE topic_id="839689" UNION SELECT * FROM gallery2 WHERE topic_id="1446529"