Incorrect address fields are loaded (initially)

Problem/Motivation

On checkout (Drupal Commerce), billing information fields match the site's default country (which is the option selected in the Billing Information settings) instead of the initially selected country. Specifically, on the billing information checkout form, United States is selected on page load but the country-specific fields match that those of Canada (which is the site's default country).

screenshot

Steps to reproduce

Checkout cart (Drupal Commerce). Although, this could be specific to my install since I couldn't find related issues so, what could be causing this?

I've also installed CacheExclude and set the `checkout` and `checkout/*` pages to not be cached.