[BlueOnyx:22510] issues changing max_children setting

[Richard Owen]

On our 5209r  server  we have been getting random 502 errors, and then in the  PHP-fpm log, we get 
"pool site26] server reached max_children setting (15), consider raising it".
 I  have set the MAX_children in the GUI to 35 , and It shows the new setting of 35.

When i check  /etc/php-fpm.d/www.conf,  max_children is still set to 15, and checking www.conf  in  php-fpm-5.6 and 7.2  both are set to 15.
I have restarted php-fpm, and that changes nothing, I manually changed the setting  in php-fpm-7.2  and under one of the sites.

When php-fpm/php-fpm-7.2 is restarted,  it resets MAX-children back to 15 in the config files,  the max_children limit of 15  errors continue 

Can you please let me know how we can set this to 35

Thanks Richard