Getting Safari 6 CSS issues

I'm getting some strange CSS issues with Safari 6 on Mountain Lion.

All form elements (inputs & buttons) seem to be having a problem with the right edge.

Check it out here...

http://cl.ly/image/282S2s0U0n0G

& here

http://cl.ly/image/1K3a3W1o2r3u

Inital enquires show it's not happening to others. Any ideas what it could be?