We can try and assist if you can provide more specific details.
Also, if you have Google Analytics installed you can see the percentage of your visitors that actually use IE.
Web design is like any other aspect of business, you have to weigh the pros and cons and see what’s best for the majority of your visitors. No website can look perfect across all browsers, devices, operating systems etc. The theme itself is coded validly and is standards-compliant. While IE9+ has become a lot more usable, older versions are very problematic and there’s simply nothing we can do about that.