Hi,
I visited your example web page with safari 7.0.3, latest webkit Nightly build, Chrome, and Firefox I see the page and behaviors as the same in all four browsers.
The page loads, I see the 3 'banner' panels, and I see the 'Learn More' box, which switches between rectangle and rhombus on hovering over it.
The 'Learn More' box is viewable for two of the sliding panels and not so in the third. The arrows indicating the direction also displays display an effect while hovering over them.
I do not see the 'portfolio posts'. Is that under the 'Learn More' effect ?
Maybe you can try with a Nightly WebKit build?