As per the title follow these steps to reproduce

  1. Fresh Drupal install with only FeedAPI, FeedAPI Node Process, FeedAPI Common Syndication Parser enabled
  2. Create Feed to a Delicious RSS URL, for example http://feeds.delicious.com/v2/rss/drupal?count=15
  3. Import the feed items
  4. Note that the title of one of the items will be used as the body for a number of other items.

This can be resolved by using SimplePie, but I haven't been able to solve it using Common Syndication Parser.