Why has the number of cards I own decreased?

Please check in "Obtain Flair" that you have not exchanged cards for flair, or that you have not given cards to another player through Trade or Share.

Note: Exchanging for flair, Trading, or Sharing cards can create a discrepancy between your grand total cards acquired and the number of cards you own as displayed on the "My Cards" screen.

■Steps for checking flair:
Tap My Cards (second button from the left at the bottom of the screen) > card with flair > leftmost button at the top of the screen.

■Steps for checking Trade history:
Tap Social Hub (middle button at the bottom of the screen) > Trade > History.

■Steps for checking Share history:
Tap Social Hub (middle button at the bottom of the screen) > Share > History.