Empty UITapGestureRecognizer buffer - objective-c

Question

I'm trying to design a really simple card game. The functionality basically consists on discovering the cards in order just tapping on them. To do this I put the cards on a UIView, and I overlay other UIView where I capture the taps. Then I just calculate which card has been tapped and I flip it.
The problem is that if I tap a wrong card, this tap appears to remain in a kind of buffer, and when I tap another card, sometimes a previous card tapped flips without being tapped. Is this buffer real or I'm doing something else wrong? If this buffer is real, how can I delete its content every time I capture a new tap?
Thanks in advance.
Problem solved :)
Here is the part of the code where the problem was, between
tapping the card and checking if it is a king.
[...] some code here [...]
// And if what we have found is a king, then we uncover the next card in the game stack and .
if ([[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardValue] == 9) {
//[self uncoverTheNextCardToPlay];
do {
[self uncoverTheNextCardToPlay];
} while ([[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardValue] == 9 && gameWindow.lastIndex < 40);
}
// And we update the realIndex with the real index index of the card just uncovered.
gameWindow.realIndex = ([[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardSuit]*10)+[[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardValue];
[...] more code here [...]
- (void)uncoverTheNextCardToPlay
{
gameWindow.lastIndex = gameWindow.lastIndex+10;
[[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] setCover:NO];
[[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] refreshCardWithCardBack:gameWindow.cardBack];
gameWindow.realIndex = ([[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardSuit]*10)+[[gameWindow.deck getCardAtIndex:gameWindow.lastIndex] cardValue];
}