Well, that's expected behavior, it should try NOT to repost anything; there is a field in the database that holds the timestamp of the last time it "grabbed" the feed and it'll attempt not to repost anything before that timestamp.
You could try this query:
UPDATE `your_db`.`prefix_TOPIC_FEEDS` SET `LAST_BUILD` = '0', `LAST_TOPIC_TIME` = '0' WHERE `prefix_TOPIC_FEEDS`.`FEED_ID` =1;
As for the link, on what you posted it has a space before the end tag at the end, is that what it's doing on your site? could you link me to a story?