I just don't get it.

Just talking about the rss on this site

If I add http://mylittleforum.net/forum/index.php?mode=rss to my reader it will get all the posts (even posts that had been created within the last few minutes)

If I then create a post on here and then go to my reader and manually refresh, the post does not show. If I wait for the reader to auto refresh at 30 minutes the post does not show. If I refresh around the 50 minute mark it shows.

I've tested in 3 different rss readers on Windows and the same happens. Manual refresh does not retrieve the latest posts