Mega Menu Forget Nav Location

I’m having issues with mega menu option. I have several links in my main nav. They all work when the mega menu option is not chosen. I’m able to add, delete, move pages around.

But I want to use mega menu. So the first thing I do is make sure I have correct location chosen. I choose mega menu make changes, add, and move pages around hit save. Go to location again and my main nav is missing. I select it from drop down again. I go back to see my nav structure and half the navigation is missing.

I’ve tried, deleting pages, recreate pages, turned off plugins, cleared cache, called hosting (no issues on there end) and can’t get it to stick. My theme is up to date.

At times I’ve been able to get the top nav to work perfectly, the mega menu works but I add one page, and it deletes half my nav and forget where the navigation should be located.