Sharing Icons stacked on top of each other

Hi,

the problem is with Pinboard theme displaying the social media icons stacked on top of each other in blog posts.

I do not see the problem with the twenty twelve theme. Furthermore, the icons are displayed perfectly OK on the site front page.

Problem persists with Safari, Chrome and Firefox.

I could not detect any difference between how Pinboard and Twenty Twelve are rendering them when I inspected with Chrome Developer Tools – yet I am very new at WordPress and I definitely miss something.

You can see the problem here: https://www.ozkanserin.com/2013/01/17/aperture-3-stop-importing-duplicates/ (see share this at the bottom of the page.

And no problem, here: https://www.ozkanserin.com

I will be glad of any help.
Thanks