Python component is running 13 times because the longest input contains 13 elements
the thing is, with your python component setup (all inputs set to item access) it doesn’t really matter if you group them in line 7, because there’s a new iteration for each element, they are just not treated as a list:
my best advice is to first have a look at some tutorials on the topic, super basic ones, where it teaches you the main differences between access types, just to get a grasp of the very basics of that component, because writing those down probably takes longer than reading them somewhere/watching a youtube video about those
[edit] this is a very simple example with tree access, that maybe simplifies your process