There's a few things that are contributing to make the buttons go to the bottom of their div. The Like buttons themselves have a vertical-align: bottom. That's being set by Facebook itself.
The other issue is that the line-height for everything on your site is set to 1.6.
You can fix either, but I'd recommend updating the line-height by adding the following to your template:
div.scsocialbuttons div {
line-height: 1em;
}
I hope that helps, but if not, let us know.
Thanks,
Alex