[plugin: WP Favorite Posts] Different buttons saving the same post

Hi. This plugin is amazing, and I love what it can do, however I have one little bug.. or something.

On my site it works on some pages, but on one page (one page using the random posts and post plugin library) every button saves the same post ID.

http://www.reeftuners.com/?page_id=494
12 differnt buttons all saving the same post ID?

Why does this happen?