Inside this function:
OnTriggerEnter2D(Collider2D other)
print the name of this GameObject:
Debug.Log("OnTriggerEnter2D(Collider2D other): I am " + name);
So you can see what is triggering what and when.
You could also print the name of the CalzonSiguiente, which sounds absolutely delicious.
Also, please use code tags: Using code tags properly
Generally to solve this sort of thing, I recommend liberally sprinkling Debug.Log() statements through your code to display information in realtime.
Doing this should help you answer these types of questions:
- is this code even running? which parts are running? how often does it run?
- what are the values of the variables involved? Are they initialized?
Knowing this information will help you reason about the behavior you are seeing.