First I would suggest you to update the theme with latest version. Current version is 1.14. To download upgrade go to your Account > Download
To support the web community we have dropped IE8 support.
I also would strongly suggest you to ask your user to upgrade their
browser. It will take few minutes and no cost
I have cross checked with IE9 during the development as well as now and it seems working fine at our end. Could you please update the IE9 version and see if it works or not.
Also provide your website url so we can check issue there. If not possible than at least few screenshots..