ie8 issue

Hi. I installed the latest version of this fantastic plugin, but I realized that my slider is not correctly displayed in IE8 while perfectly working in FF and IE9. The JS engine works (I see the changing of images) but it looks like all images collide or being partly hidden. I think it’s a matter of css, but all my attempts were vain. Any suggestion, please?
You can see a comparison here. Thanks

http://wordpress.org/extend/plugins/wp-orbit-slider/