When working with Forms you may notice such warning message, indicating that data you've provided into form element (like pricing for select values) may be lost during save:
Saving form with multiple elements means passing lots of POST data to HostBill server, which may be filtered out by php.ini max_input_vars directive.
How to fix it
If you see this error make sure to set value of max_input_vars higher in your php.ini file, like:
max_input_vars = 10000