Carvana asking me to renew registration before selling? (California)

Hi, I'm in the process of selling my car to Carvana, and I was just told that they require my registration to be valid for at least another 75 day (it currently expires at the end of Jan 25). This means that for me to proceed with the process I have to renew my registration and pay another ~$500 for a car that I won't be driving at all. Is this expected?