Like Button Working Inconsistently

I’m having a weird thing happen with the Like button. It works great on some posts, but not all on others.

It works here:
http://www.laurenbphoto.com/blog/2011/leah-and-johns-wedding-featured-on-style-me-pretty/

But not here:
http://www.laurenbphoto.com/blog/2011/libbi-and-aarons-engagement-session-in-downtown-vancouver/

It’s random and I’ve tried everything. I even tried deleting the App and creating a new one. No help.

Any thoughts why this might be happening?