Thanks for the very detailed report @ClaudioBengoaPonce! This helps a lot making the issue clear!
As I see it the main problem here is automatic creation of card items when indenting, right? Another user described this here: Card Item should not be preserved when indenting under existing Card Item
Current workarouds to remove the indented card items
I think the hint number is correct though? In your left/red picture it is 4 for 01, 01.1, 01.2 and 02. The rem Child 03 is not part of the card. You can see that in the Card Preview because it doesnât show multi rem cards correctly, but you can see that in the (document) queue.
The question is rather if indented card items should count towards the parent card item (right image). I feel this is sometimes useful to express more complex thoughts. If you want to have an indented rem to form a separate card you have to make it not a card item.