Main Menu – location setting and save issues

Hello,

We migrated our site to a new server a couple of days ago. Now when I make an update to our Main Menu, it unassigns the Main Menu from that location in the Enfold Child Theme, and I have to manually reassign it.

And today, the last drop-down menu of our Main Menu was replaced by an event organizer’s name (we use The Events Calendar by Modern Tribe). No edits were made to the Main Menu. When I tried to change it back, the new menu items won’t save. It used to be a menu called “Contact” with four pages in a dropdown below it. When I tried to re-create that, the drop-down is wiped and just the “Contact” header is saved.

This is urgent – hopefully you can help.
Temp login details are included

Thanks so much