Optimize CSS / Mega Menu Issues

Hi, the Optimize CSS option really improves my site performance and speed. However, it also does something strange to my menu. At the link provided, you can see that right now, the menu is aligned to the right of and beneath the logo. However, when Optimize CSS is disabled, the menu is as it should be, aligned to the right of and to to the top with the logo.
Do you know what I can do to resolve this?
Thanks,
Michael

The page I need help with: [log in to see the link]