Meta Box

But what did you do for the sections__add to fix it? Is there a wrong format too?

I mean, I see that the other pages, like "about-us" or "policy", are missing their meta boxes as well. And I see them in custom fields. The same situation.

But I am not sure how to debug it, when we have big strings and it is not obvious.
I found several unserialize services which can unserialize string. Some of them throw errors some of them not and return an array. I do not see anything suspicious here (about us page)

a:4:{i:0;a:4:{s:12:"section-name";s:29:"Intelligent testing solutions";s:18:"sections__template";s:8:"overview";s:8:"overview";a:2:{s:15:"overview__title";s:29:"Intelligent testing solutions";s:19:"overview__sub-title";s:157:"We work to provide the digital economy with automated testing solutions that are affordable, simple, and comprehensive to meet a variety of automation needs.";}s:8:"contacts";a:1:{s:15:"contacts__items";a:1:{i:0;a:1:{s:14:"contacts__type";s:5:"email";}}}}i:1;a:4:{s:12:"section-name";s:11:"Our mission";s:18:"sections__template";s:8:"features";s:8:"features";a:1:{s:18:"features__articles";a:2:{i:0;a:4:{s:5:"title";s:11:"Our mission";s:4:"text";s:149:"We have seen our clients face the frustration of finding an automation solution that is affordable, comprehensive, easy to set up, and simple to use.";s:5:"image";s:2:"47";s:18:"features__articles";a:1:{i:0;a:2:{s:21:"title_icon_visibility";s:4:"text";s:4:"text";s:387:"To tackle these problems, we initially developed intelliQ Studio as a free alternative to commercial test automation solutions, and as a versatile tool that is easy to use for both beginning and advanced testers.

Since then, intelliQ Studio's adoption rate has accelerated. The tool was ranked as a top automation tool by popular automation websites and by many testing communities.
";}}}i:1;a:4:{s:5:"title";s:9:"Our story";s:4:"text";s:151:"We have seen our clients face the frustration of finding an automation solution that is affordable, comprehensive, easy to set up, and simple to use.
";s:5:"image";s:2:"46";s:18:"features__articles";a:1:{i:0;a:2:{s:21:"title_icon_visibility";s:4:"text";s:4:"text";s:385:"To tackle these problems, we initially developed Katalon Studio as a free alternative to commercial test automation solutions, and as a versatile tool that is easy to use for both beginning and advanced testers.

Since then, Katalon Studio's adoption rate has accelerated. The tool was ranked as a top automation tool by popular automation websites and by many testing communities.
";}}}}}s:8:"contacts";a:1:{s:15:"contacts__items";a:1:{i:0;a:1:{s:14:"contacts__type";s:5:"email";}}}}i:2;a:4:{s:12:"section-name";s:8:"Contacts";s:18:"sections__template";s:8:"contacts";s:8:"features";a:1:{s:18:"features__articles";a:1:{i:0;a:1:{s:5:"image";s:2:"47";}}}s:8:"contacts";a:4:{s:15:"contacts__title";s:10:"Questions?";s:20:"contacts__title-text";s:71:"Have a question for the team about our products or our services? Shoot!";s:25:"contacts__additional-info";s:52:"Organization number: 87163457836, Stockholm, Sweden.";s:15:"contacts__items";a:2:{i:0;a:3:{s:4:"icon";s:2:"21";s:14:"contacts__type";s:5:"email";s:17:"contacts__contact";s:16:"[email protected]";}i:1;a:3:{s:4:"icon";s:2:"21";s:14:"contacts__type";s:5:"phone";s:17:"contacts__contact";s:14:"+46 73430 5337";}}}}i:3;a:5:{s:12:"section-name";s:36:"The future of test automation is now";s:18:"sections__template";s:4:"hero";s:4:"hero";a:2:{s:11:"hero__title";s:36:"The future of test automation is now";s:13:"hero__buttons";a:1:{i:0;a:3:{s:11:"button_text";s:14:"Request a Demo";s:15:"button_behavior";s:9:"open_page";s:11:"button-link";s:31:"http://intelliq.se/#get-started";}}}s:8:"features";a:1:{s:18:"features__articles";a:1:{i:0;a:1:{s:5:"image";s:2:"47";}}}s:8:"contacts";a:1:{s:15:"contacts__items";a:1:{i:0;a:1:{s:14:"contacts__type";s:5:"email";}}}}}

I made fixes with the correct format of data provided by you through the admin panel, by updating custom fields data.
But after updates those custom fields are gone now https://monosnap.com/file/rLgiXJvBzqGw2LJmeuwBDRc7likjqy
And sections data is blinking on page reload.

If yes what email address we could use?

I should ask my client first. I think we could try to debug it by ourselves at first.

sections.php file (metabox config) https://codepen.io/maliyshock/pen/ExVvjxW
this is template for the main page https://codepen.io/maliyshock/pen/yLYoNyY?editors=1000

custom fields and settings of the main page https://monosnap.com/file/YWHYo0y3MMsUY659DC7RsCt1jD8Yjz

No, the field ID did not change.

Sometimes the field has different sizes.
Like here https://monosnap.com/file/ehRc0moSn6j03xD5F7VOlQxib3xvy4

Few minutes after I made this post I asked myself. Why would not I use the same functionality for admin panel as for pages?

Cause it works!

Screenshot_1: https://monosnap.com/file/jiYwzrMwVLDYLyUJq5vbOh40YBahIi
The same file with $meta_boxes config I made request to get the meta boxes using get_post_meta method with $_GET['post'] to get the id of current page.

Then I created another array, to filter out sections without any id-s.
I used makeIdFromString custom method to rid off all of the spaces and capital letters
And then I put this array to the config.
That's it. It works.