In wordpress some times user is not able to save the page or process some queries due to max_input_vars limitation.
You can put that in the .htaccess
file like below:
php_value max_input_vars 1000 php_value suhosin.get.max_vars 1000 php_value suhosin.post.max_vars 1000 php_value suhosin.request.max_vars 1000
If you have access to the cpanel then find or create php.ini
file file in root folder and add below lines in that at end:
max_input_vars = 1000 suhosin.get.max_vars = 1000 suhosin.post.max_vars = 1000 suhosin.request.max_vars = 1000
For that put below line in the wp-config.php
file.
@ini_set( 'max_input_vars' , 1000 );
This will solve your problem. you can increase as you want as per your requirement.