Sometimes RSS feeds give display problems on planet.squat.net
Here's one way how to debug and fix that.

• Go to http://validator.w3.org

• Fill in the website feed URL that you want to debug.

• Click on "check".

• Look at which word is giving the error and remove and re-type that word in the posting.

• Save the post.

• Try the "check" again.

Example screenshot :