This thread is resolved. Here is a description of the problem and solution.
Problem:
The field group won't save any new custom fields, so I had to create a second and third group.
Solution:
It should be a server limitation problem, please try to increase the limitation of your website, for example, in wp-config.php, add below line:
@ini_set( 'max_input_vars' , 3000 );
Relevant Documentation:
https://www.php.net/manual/en/info.configuration.php#ini.max-input-vars
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Tell us what you are trying to do?
Make one custom field group for all categories of search criteria I want on a search form. All custom field types are set to check boxes, some have many options (20+). A a certain point, the field group won't save any new custom fields, so I had to create a second and third group. I don't mind using this workaround if there is a limit to the amount of fields or labels within a group, but if there isn't I would rather troubleshoot it and fix it early on.
What is the link to your site?
hidden link (this page has the whole list of custom fields, all are separated into three groups on the backend)
Attached screenshot shows backend, where search criteria is split into 3 custom field groups.
