Possible that your safari is keeping old settings and cached old feed results. Can you delete the feed and re-add it, then tell me what happens please?
Also, I fired up Safari on my home Dell Vista PC and show the same problem.
To be clear, this occurs when you click the "RSS" button from the Safari address bar. When you press "RSS" you get the Safari RSS reader. When you click the link from within the reader you get the a link formatted like:
Apparently this is an issue with Safari. Instead of following the <link> elements as defined in the RSS standards, safari likes to make up its own links using the GUID of each article.
We'll look into fixing this, but I would advise using a different RSS reader until then.