Apologies, it appears to be, the issue is likely with the floats and IE’s comprehension of widths set as percentages. One possible compromise would be the set the content and sidebar areas as fixed-width pixels, basically turning off the responsive (mobile) design. The other option would of course be to stop supporting IE8 on your website.
If neither of those compromises (mind you that when adding hacks to support older browsers, that will always come with certain compromises) and you can no longer use StartupPro, then we would be happy to give you a refund.
Thank You