Bullets(group) acting weird

[ctmartinez1992]

So i have this method that creates the bullets

createBullets() {            this.bullets.createMultiple(30, 'bullet');            this.bullets.setAll('anchor.x', 0.5);            this.bullets.setAll('anchor.y', 0.5);            this.bullets.setAll('outOfBoundsKill', true);}

and then i update them here to fire the bullets

        update() {                    if (this.fireKey.isDown) {                        if (this.game.time.now > this.firingTimer) {                            this.fire();                        }                    }                    if (this.game.physics.collide(this.bullets, this.enemies, this.bulletCollidesEnemy)) {                        this.score++;                        this.scoreText.content = "Score " + this.score;                    }                }        }

And the collide handler and the fire mechanism

        bulletCollidesEnemy(bu, bo) {            bu.kill();            bo.destroy()        }        fire() {            var bullet: Phaser.Sprite = this.bullets.getFirstExists(false);            if (bullet) {                bullet.reset(this.player.x + 12, this.player.y - 6);                bullet.body.velocity.y = -300;                this.firingTimer = this.game.time.now + this.fireTimeControl;            }        }

This sometimes works well and the next second its broken and then works again, here, you can see it for yourself: https://dl.dropboxusercontent.com/u/52790690/HTML5%20GD/game4/game4/default.htm

If you hold space it will fire half a dozen of bullets and then some of them will just get stuck and not move at all. Eventually you will run out of bullets in the group because they are all stuck in there.

 

I need help on this one, i can't understand what i am possibly doing wrong.