Based on my understanding, some sites supply or service other sites with cards through API which means they do share same database but is updated simultaneously which means that if a card is sold, it is marked as sold at all other sites. That could explain same data from one site compared with others.
But in this VCLUB case, why people keep buying despite too many complains? Its also seems that they are out whack and scamming with so many other scam domains? Im seeing people here sending links such as
https://trytobuy.qa https://unitedshop.su/ https://ride-my-bike.in and admins still allow them to be active here?