Prototype applied for only one object

I just got a little problem in my code.

I've 3 objects defined by a 'class' and when I call this method, it's only executing for the first object.

Box.prototype.hit = function() {

    if (controller.space) {
        // Si player détectée en diagonal
        if (this.id - 12 === player.id) {
            console.log(this);
            // Décalage en diagonale de la position de la box
            this.x += this.boxWidth;
            this.y += this.boxHeight;
            currentLevel[this.id] = 0;
            this.id += 12;
            currentLevel[this.id] = 2;
        }
        controller.space = false;
    }
}

In this code, the second if is testing the id of the first object defined and the others are not spotted. However I have prototypes like this which are working.

Thanks for help.