menu formatting (.css?) question

Working on client migration from their hosting to WPEngine.

Cloned the site using ManageWP.

Old site:
New site:

The issue is with the menu. On the original site everything is formatted correctly. On the new site the menu formatting is broken. The client install had a bunch of additional folders on the server, so I'm not sure if they hid .css formatting somewhere, or if something just broke when migrating.

Any help on figuring where I can go to look for the .css to change for the menu would be appreciated.