OK this thread is very old but for those looking for the solution, I've just encountered this with eZ 4.4 and the cause is that the RSS I'm using is having the same <link> (linking to the main website of the rss feed) for each items thus making eZ thinks all items are the same. But each items of the feed has a different <guid> which makes sense here. So I've edited cronjob/rssimport.php and at about line 210 I've inverted the two if conditions to prefer to use <guid> if it does exist.
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