If some of your readers are using Internet Explorer version 8 or older, keep in mind that our newer themes (like Misty Lake) are no longer designed for older browser versions. Content should be readable/accessible, but the design may look off due to IE 8's lack of support for mobile-first design techniques.
This decision was made after reviewing WordPress.com's traffic statistics, where we found that IE 8 users make up a very small and dwindling percentage of the overall user population.
Sorry I could not help you more, and I hope you can still find a theme that meets your site's needs.