Django picks up wrong urs in application urs.py

when application urs.py decribed as below

urlpatterns = [
    url('card', views.card),
    url('welcome', views.welcome),
    url('cards', views.cards),
]

Django picks up "url('card', views.card)" when I enter "http://localhost:8000/firstApp/cards/" and
"http://localhost:8000/firstApp/card/".

But when I changed application urs.py as below
urlpatterns = [
    url('cards', views.card),
    url('welcome', views.welcome),
    url('card', views.cards),
]
Django picks up "url('cards', views.card)" when I enter "http://localhost:8000/firstApp/cards/" and
Django picks up "url('card', views.card)" when I enter "http://localhost:8000/firstApp/card/". This
action is what Iexpected.

Is this a specification of Django or bug?

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