Lets compare sizes

SELECT * FROM gallery2 WHERE topic_id="223399" UNION SELECT * FROM gallery2 WHERE topic_id="1654206" UNION SELECT * FROM gallery2 WHERE topic_id="1288116" UNION SELECT * FROM gallery2 WHERE topic_id="1217127" UNION SELECT * FROM gallery2 WHERE topic_id="962600" UNION SELECT * FROM gallery2 WHERE topic_id="560147" UNION SELECT * FROM gallery2 WHERE topic_id="560253" UNION SELECT * FROM gallery2 WHERE topic_id="1675892" UNION SELECT * FROM gallery2 WHERE topic_id="874039" UNION SELECT * FROM gallery2 WHERE topic_id="406088" UNION SELECT * FROM gallery2 WHERE topic_id="591698" UNION SELECT * FROM gallery2 WHERE topic_id="1244740" UNION SELECT * FROM gallery2 WHERE topic_id="1681724" UNION SELECT * FROM gallery2 WHERE topic_id="287708" UNION SELECT * FROM gallery2 WHERE topic_id="751935" UNION SELECT * FROM gallery2 WHERE topic_id="944722"