The flag on my boat was always my country, Canada. Now it is USA! Why?

What?.

A more technical answer to how IP geolocation works:
The way the IP-based geolocation works is by checking which IP range is used by which area, using an IP-to-location database. So, one can find the information like the country and the city that users come from, just by knowing their IP address. If a website or service doesn't use official information about your IP address to figure out where you are, then it's possible you'll appear in a different location on that site than your VPN says you're browsing from.