Associated related posts don't override article posts

I specified three related posts like this:

![image](https://f.cloud.github.com/assets/36432/1162017/42263f80-2000-11e3-90be-b6baa637b197.png)

I expected them to override the related posts. Instead, they seem to be included in all of the posts:

![image](https://f.cloud.github.com/assets/36432/1162024/6af86fdc-2000-11e3-91e7-6998c0186a66.png)