First, let me say that most of the name on the ranking for our server is foreign to me as well, thou I recognize #1 to be a known ptw.
I do, however, have theories as to how this could happen. It is rooted in the fact that coupon can be used.
1. nublets, nublets are coupon rich, knows nothing of the game and if it's semi-fresh so they just missed the actually awesome luckyboard, this might be the first "awesome" event they see, guess what happens next. Now, the 70 and 90 might be a bit much for them, but the others are certainly possible, maybe even the 70.
2. Alt trolls.
Alts exist. And alts collect coupons, one of the most well known type of alt is plunder alt and they, in the process of fulfilling their role, gets at least 15 coupon a day. They might collect from other sources too and might have their nublet coupon still. And alts might not spend any coupon, so it just builds up.
And if the owner of those alts wants to troll, either trolling you in particular or just making the ranking reward hard to reach in general, they could burn the coupon on those alts to place them highly. An plunder alt that have been in service for 2 month will have at least 900 coupons, enough for 45 pts. And who knows how much more they might have.
For reference, I could get to over 100 points easily if I didn't use my coupons on lucky board last week. In fact, I could get to 150-200 pts using only one month of coupon income and I don't even plunder (I could but I wont). Not that I would burn coupon on this, I only rly spend on cave key mystery fruit and lucky board, but I could. So coupon rich character can very well exist.