From the meets I have done we competed in different weight classes (181, 198, 220, etc) and age divisions (junior, open, sub masters, masters, etc). The flights were setup by weight class.
Once completed and individual could take the total and find their class ranking which are class 4 up to class 1 then masters and elite.
When I see results I will see someone got a total at what weight they competed. I will assume open age unless stated otherwise. But I hardly see what the total is. From my understanding different federations will have different totals at different weight classes and that is why you will usually just see a number.
So ya masters could be a total from a meet or an age grouping. Therefore one could get a masters total as a masters competitor. Open is 18 to 39, at least where I compete. So by adding junior or masters to a total it makes it more impressive.