Possible bug in card counting?

Colominas

The number of cards shown in "My Cards" section (2999) does not match the number of cards shown after opening a pack (3001, and '3000 cards' achievement already unlocked). Is this a bug?

mrtwrecks

I’ve noticed this as well and was wondering the same thing

shadowslinker

if you have a card for trade it might deduct the count by one