Facebook like popup doesn't appear completely

Hello,

I love this plugin. Except that today I wanted to switch from the facebook share to the facebook like button and I found out that the pop-up that appears after clicking ‘like’ doesn’t appear entirely.

It looks like it’s contained within the borders of the div of the like-button.

I played around with z-index to figure out if I could get it to ‘pop’ out, but I couldn’t.

http://wordpress.org/extend/plugins/social-sharing-toolkit/