Hello,
I am having a problem where an advanced custom field (an image field) that I created for menu items is having problems saving. I contacted ACF Pro to get some assistance and they stated the following:
It looks like the saving issue is related to a theme conflict since your theme is also adding some meta to the menu items, deactivating the current theme and switching to the Twenty Nineteen theme appears to fix the saving issues.
I can recommend that you reach out to the author of the theme so that they can advise on ways of working around this.
Here is a screencast I created to demonstrate the issue further: https://cl.ly/79a7b2e7a24e.
Any help Theme X can provide would be greatly appreciated.