Syndicated feed plugin

Hi all, hope someone can help. I am using the feedwordpress plugin to syndicate rss feed on my blog and generally keep it fresh. However, I notice that there are some differences between syndicated posts and original posts. This manifests itself with a social bookmarking plugin I have – the social bookmarking logos appear at the bottom of my original posts, but not at the bottom of my syndicated posts.

I have looked at the database to see if I can see any differences between syndicated posts and original posts and there is no obvious difference as far as I can see.

So, does anyone have any idea what might be different between the two types of posts, and why the social bookmarking links don’t appear at the bottom of the syndicated posts?

Thanks in advance…