Safari not picking up spans

I have my website working as required in Firefox, Chrome, IE and Opera on my windows 7 laptop. A few bits required CSS hacks which only changed the margins a bit which worked ok.

However this won’t work with Safari as it does not seem to be picking up the correct <span> elements. I have a list of elements which expand into <spans> if you look on inspect element on ay of the other mentioned browsers. However on Safari it doesn’t pick up these spans, and doesn’t display these. In these spans are share buttons from addthis. They show up as background images you can click to share the page. This is the only part that isn’t working, any help please?