I found the same thing when searching for the death I mentioned. I wanted to check what information I had already provided, as I wished to try again, but couldn't remember what I had provided and could find no way of checking previous orders/requests.
You would think they could use a bit of common sense and for example tell you there is a birth with all details matching, except father's name, but it probably comes down to resources. I know if you have reference numbers and perhaps a name is misspelled on the index, and you order using what you believe is the correct spelling, eg name is in index as Smyth, but you order as Smith, then they will not issue the certificate, even if other reference details tally.