
When you register a litter of puppies you are asked both the date of mating and the date of birth, so that would mean the breeder had made two mistakes.
Then there is the fact that the KC website has been having major problems ever since September so there's a possibility that it is their mistake.
I doubt you would be able to transfer ownership at the moment as you have to state the date the pup was bought and the dates won't add up at the moment.
What's the date of birth on the microchip?