Adding cards to pile only works with repeated cards

[romosken]

When I try to add drawn cards from the deck to one pile, it only stores when I pass repeated cards, in any other ocasion, it does not add to the pile!

Here is my code:

  jogadores = ['Rodrigo']
  baralho = requests.get(
      "https://deckofcardsapi.com/api/deck/new/shuffle/?deck_count=2").json()
  id_baralho = baralho['deck_id']
  
  for jogador in jogadores:
    response_cartas = requests.get(f"https://deckofcardsapi.com/api/deck/{id_baralho}/draw/?count=11").json()
    cartas = [carta['code'] for carta in response_cartas['cards']]
    cartas_juntas = ','.join(cartas)
    url =f"https://deckofcardsapi.com/api/deck/{id_baralho}/pile/{jogador}/add/"
    response_pilha = requests.post(url, data={"cards": cartas_juntas}).json()
    print(response_pilha)
  
  pilha_rodrigo = requests.get(f"https://deckofcardsapi.com/api/deck/{id_baralho}/pile/{'Rodrigo'}/list/").json()
  print(pilha_rodrigo)`

I basically create a deck, draw eleven cards, get each one's code, and add to a new pile, in this case named Rodrigo.

Here is my debug session, where it only added the 6C cards:

Already tried adding with the GET route, same issue.