Strange Message While Booking

I am trying to book some nights at the Hilton Papagayo in Costa Rica on Points. When I search for rooms, the following message comes up in yellow on the top of the screen:

There are no rooms available for standard reservations on 17 Jun 2014 - 18 Jun 2014 at Hilton Papagayo Costa Rica Resort & Spa. Because you are an HHonors® Diamond VIP, you can choose from the rooms shown below, view a list of available dates at this hotel across a 2-week range, or view nearby hotels..

followed by a list of all of the available rooms and their associated rates (both dollars and points).

I am NOT a Diamond member, but it not only shows me availability, but it allows me to book rooms. What does this mean? Do I need to worry that they won't honor my reservations?

Thanks