Chances are that you might need to adjust a php setting
Plugins and features like supertable, matrix and neo generate a huge number of form fields.
PHP by default limits the max number of fields to 1000.
Chances are that you might want to increase the number of fields.
; in php.ini max_input_vars=10000
You can only set this in php.ini.
With fortrabbit, you can modify this value in your php control panel.