Afghanistan as the default country?

So i believe you have made these selections in the field settings

I'm thinking you had previously selected Afghanistan as the default country before updating to Argentina at the same time as you restricted addresses to only use Afghanistan. That's the only way I know it could be accidentally selecting Afghanistan, and I believe I just committed a patch to stop that. Can you also confirm that your site has been set to use Argentina as the default country in your regional / language settings? And can you go resave the field settings form to ensure it has Argentina saved as the default country? You might need to disable that "hide the country select list" checkbox in order to update the default country value.

Ahh, I was just doing some manual tinkering with an address field value, and I realized that it initializes to Afghanistan if you don't have a site default country set yet. Go to your regional / language settings and select Argentina as the site default. That should fix any lingering issue.