Hoping someone can help me with an issue im having with some AddThis buttons on my site. Iv added them to this site and they seem to be working fine, however their is an issue with their widths. As far as I am aware each button should have a variable width so that it only fills the space it needs? however the buttons on my site seem to be displaying at a fixed width, which is far larger than some of them need to be and so leaving a large white space.

Anyone got any idea why this is or how to fix it?

the site is here: