I’m using the [mphb_availability_search] and when an accommodation is already booked for the dates searched the accommodation is still showing on the search results page.
Are you able to actually book that accommodation, which is displayed on the Search Results page? If it is not available for selected dates, it should not be displayed in search results in the first place. I would kindly ask to provide your website URL and temporary access to WordPress dashboard in a private reply, so I take a closer look at the issue.