Choosing wrong currency for Colombia

Hi. Our site has COP as the default currency in the General tab and it is the currency we store prices in for the site. It is a hidden currency

In the location tab COP has no selected currencies. Colombia is in the USD tab

In the checkout tab, COP is not a checkout currency

This has always worked fine, so users in Colombia get presented prices in USD

This stopped working today though. Now in Colombia with a private browser I get prices in COP.