On the Main page we have the Domain Overview report, when I click on that to display detailed information of those machines I noticed the numbers don't match.
The main report gives 1014 (scanned) and 12 (it can't scan) which give a total of 1026 devices.
After clicking on the domain name it displays 1056 in the list.
Looking into this, the Domain Overview doesn't include None-Active machines, but the detailed report does.
Was this intentional as it did puzzle me for a while and was questioning if the data as accurate until I figured it out.