Hi Jon,
don't know on what kind of device you look at the forum, but on a normal computer you can hoover with the mouse over the flag and it will show in text the name of the country.
But the flag represents the country someone selects and not the location they enter in a separate field. In my profile I set the location to France, which is where I live now, but my nationality is Dutch, and that is what my flag shows.
For me that was a logical choice, to show that I'm Dutch, to give some insight in my cultural background.
So it is not always correct, and others might even set it at random, to not reveal anything.