Menu malfunction

My site, colinmegill.com, broke when I changed the colors of the links back to their original blue in the template options on dashboard. I don’t know what that changed, but suddenly, as you can see if you visit, central1 menu items appear below… I don’t know how to fix that. Is there something specific that is wrong when that happens, or is it different every time? That change also seems to have made the white space considerably wider. I’ve checked the CSS but nothing stands out to me in the /Menu section. As you’re probably aware, I’m a neophyte.

Thanks!!