RSS Feed Not Updating Correctly

http://avatarrp.aforumfree.com/feed < For reference only.

I'm not sure if this is the place to put this...but I've noticed that my RSS feed of my forum doesn't update every new post.

At first I thought it might be choosing posts only from a certain category, which isn't the case. It almost seems random sometimes.

Can anyone help me please? And thanks!

It doesn't show the post, but it shows the title of the thread !

Oh I know that, I meant it doesn't detect some posts/threads at all. Not even the title.

Like I said before, I thought it might had been only detecting certain posts/threads from a certain category.

Take this forum for example, I thought it might had only been detecting only new threads/posts from 'Connection Problems' but that wasn't the case.

It's like it just chooses some at random. What could be the problem with that?

Whats the link off the rss feed you have?