Feedoo theme issue with I.E.

Hi.
I recently downloaded a theme called “Feedoo” to be used on my blog but the version i downloaded has a bug with internet explorer.
The image on the header gets cut-off if visualized with internet explorer. it doesnt happened w other browsers tho (like Firefox and Safari).
The funny thing is i found a version that can be visualized perfectly w internet explorer but i still dont know how to fix the problem.
if you go to worldpress.it and load the demo page w internet explorer is gonna be different than gonig to themes.wordpress and running the the test page.
Does anyone out there know how to fix this bug? I know it must be simple but i dont have a lot of experience.
Thanks
Luke