Divi’s Fullwidth Menu Module grabs Max Mega Menu’s primary menu

Hello,
The Max Mega Menu is working very well in the primary menu bar in my Divi child theme: https://wesleyanit.wpengine.com/about. I have WP menu named “Main” set to show there.

However, further down on the About page, I have Divi’s Fullwidth Menu module, wherein I choose another WP menu “About Submenu” to show. But with Max Mega Menu activated, the menu “Main” shows here instead. Weird.

So the menu is showing double. I deactivated all other plugins, and error persists.