I saw it while it was still up and it DID say $59.95 per day.
In the summary it did not say 'per day', but you wouldn't expect it to.
All that happened was the multiplier glitched after choosing Cheers.
I honestly cannot see how Carnival would be required to, or even why they would choose to do anything for anyone.
What they should do is say, "OK, you chose Cheers for $59.95 per day, which day do you want?"