Jetpack's Sharedaddy Icons Jumbled

Hello! Terrific theme, first of all. I’ve tried several themes to get the right “feel” for my blog, and nothing has come closer to the mark than Pinboard.

I recently added WordPress’s Jetpack plugin to extend some functions of my blog, but ran into a problem when using its share icons. Whenever I try to use the official buttons, they appear jumbled on my posts, often stacking on top of each other (see for yourself at the bottom of this post). I’ve reproduced the problem on both IE and Chrome. Is this a problem with Pinboard, Jetpack, or me? And does anyone know how to fix it? I’m not extremely tech savvy but I know a little HTML and CSS—just not enough to figure this out on my own.

Thanks in advance!
Jeremy