When you reload the adapter values after modifying an existing StoredProcedureWithSignature service at the backend, the service parameters are updated, but the input fields are not updated. To work around this limitation:

Add new arguments to the end of the argument list in the stored procedure definition. Do not add new arguments in-between existing arguments in the list.

When you change the order of the service parameters, you must re-edit the input fields for the parameters manually.