Cnewc it may pay to ring and check departure time, We have been onto Spirit website and there are no late departures in November.. Could be a typing mistake.
Times given don't match your times. Site shows all 7.30pm departures ex Melbourne for November. Get there later and you may miss the boat. Concerned you may have been given wrong times, that's all.

Check closer to the day of the sailing Cnewc. There is no need to panic. There are definitely later sailing times and people are misreading this thread and/or the SoT website. Your ticket was generated and emailed by the system. The whole boat would be empty of times were incorrect.