Submenu Dropdown Offset

Site:
http://lindenbp.com

I inherited a site, and have been fixing CSS issues for a few days. Most things are now fixed, but I cannot figure this one out.

In the dropdown menus, if you hover over "Our Practice", you will see "Providers" is a dropdown sub menu. When the sub menu drops down, it is blocking the regular dropdown menu. How can I offset the dropdown sub menu?

Thanks