Those users have won the prize fewer times than they should have actually. You should check the number of tickets of those users in some lottery rounds instead of having doubts about their number of wins. Most of them are big whale.

The first user had won the Lamborghini from 10th round. And the second user had won the Lamborghini from the 9th round, he had come in the forum to claim his Lamborghini prize. It isn't a big deal for them to win the prize more than once from the weekly lottery draw.