A recent default install onto Joomla 3.9.21 of both Breezing Forms and Content Builder I noticed that when I disabled all the Euro currency defaults and added a new AU currency and made it active.
The currency within the shopping cart then defaulted to the US dollar.
A perusal of the breezingcommerce_currencies table the "published" cell was still 0. The default and ordering were correctly set. Just wondering whether it was me or something else.