I can't see the 60+10 but from the 60 days which is April 1st there's TONS of availability so not sure why it wouldn't be showing any for your dates.
Are you looking at the app or website?
I happened to be looking on the website.
If you really aren't seeing anything I'd call to ask a CM if there is availability or if something is going on that they are not taking reservations for those days.
But also as PP's have said just keep checking.