ArtAcer: I just started playing and have been steadily improving I shot a 44 in a tournament as a hack. But I was beaten by a guy who shot a 30 and is an amateur, in fact just below him was a guy who shot a 31, and just joined this game a week ago?!
Congrats for advancing to Amateur in the meantime!
Besides the subject of cheating with multiple accounts, there is nothing false for an amateur to be shown on the Hack leaderboard of a tiered tourney.
They and you started the tourney as Hacks (tier class) and you'll be eligible to play in this tourney under Hack conditions until it ends, regardless of changes in your tier. Today you also stand there as an Amateur and may continue to play there.
BTW: The best score in the Hack tier is 28 now, shot by an Amateur with a 62 average. Go figure!
That said, you might want to enter a Monthly with unlimited play, freezing the "Amateur" conditions and thus helping to drop your average if you decide so.