From the looks of it, I think Recreation.gov has some 'splainin' to do.
And PLEASE do not call and yell at the Inyo people. They are just "users" of the recreation.gov site. Some software people in another part of the country are the ones running rec.gov.
Edit: I posted a revision on the next page. Inyo tells me there are already lots of cancellations going on online. So days that were originally full are opening up.