SpriteKit Incorrectly Detecting Multiple Collisions

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I have been going through a SpriteKit tutorial that makes a Flappy Bird Style Game. One of the issues I am having, is that it is firing off the code for collision detection incorrectly.

Sometimes, this goes perfect...it hits the ground, it fires the method for when it collides with the ground. However, at seemingly random times, it will hit the ground, and fire off the method for ground collisions anywhere from 2-6 times. It doesn't matter if any other nodes are present on the screen or not. I can sit and let it drop immediately, and sometimes I get the collision code correctly ran once, other times it runs several times. Is there something wrong in this code causing it to do that?

- (void)didBeginContact:(SKPhysicsContact *)contact
{
    SKPhysicsBody *firstBody, *secondBody;

    if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask)
    {
        firstBody = contact.bodyA;
        secondBody = contact.bodyB;
    }
    else
    {
        firstBody = contact.bodyB;
        secondBody = contact.bodyA;
    }

    if ((firstBody.categoryBitMask & pillerCategory) != 0 &&
        (secondBody.categoryBitMask & flappyBirdCategory) != 0)
    {
        [self pillar:(SKSpriteNode *) firstBody.node didCollideWithBird:(SKSpriteNode *) secondBody.node];
    }
    else if ((firstBody.categoryBitMask & flappyBirdCategory) != 0 &&
             (secondBody.categoryBitMask & bottomBackgroundCategory) != 0)
    {
        [self flappyBird:(SKSpriteNode *)firstBody.node didCollideWithBottomScoller:(SKSpriteNode *)secondBody.node];
    }
}
- (void)pillar:(SKSpriteNode *)pillar didCollideWithBird:(SKSpriteNode *)bird
{
    NSLog(@"Did collide with bird");
    [self showGameOverLayer];
}

- (void)flappyBird:(SKSpriteNode *)bird didCollideWithBottomScoller:(SKSpriteNode *)bottomBackground
{
    NSLog(@"Did collide with scroller");

    [self showGameOverLayer];
}

asked 30 secs ago

user717452

153

SpriteKit Incorrectly Detecting Multiple Collisions