Facebook Comments / Same Comments Every Post

I've got Facebook Comments enabled on my site, but it puts the same comments on every post.

I think I know where the issue is. I just don't know how to resolve it.

Basically, I've got FB Comments set up to populate the href field with the current page's permalink. (I can't paste it here, as php isn't allowed. But, you can see it in my page source, next to "fb:comment."

In theory, it should populate the permalink section above with the page of the site the comment's being left on.

But, if you look at this post...

http://www.runhundred.com开发者_C百科/workout-music/snoop-dogg-wiz-khalifa-bruno-mars-young-wild-free-96-bpm/

...then look at the page source in a browser, you'll see that the permalink that shows up next to fb:comments is this one:

http://www.runhundred.com/workout-music/dj-merritt-blake-potter-stick-of-sin-132-bpm/

So, I guess my question is this: Why is the site pulling up the latter permalink, not the one of the post being viewed?

Any ideas would be appreciated.

Thanks.