how is that possible?

[charlize]

i did a little test the last few days, i have bought 2 games, i have played both games for about 20 hours(well i was afk-ing) and i noticed with game 1 where i instantly sold 1 duplicated trading card as soons as i have received it that i don't receive even the least amount of trading cards(or even a new trading card) which i'm usually supposed to get like for example you can get 5 of 10 trading cards for a game, and with game 2 i haven't sold any duplicates during this 20 hours and received 3 duplicated trading cards and 1 unique trading card.

so why do i get more duplicated tading cards when i don't sell any trading cards from a game while i don't receive even a new trading card after selling the first received duplicated trading card?

[cSg|mc-Hotsauce]

Drops are completely randomized. Sometimes you get zero duplicates, other times you get many.