yes, but probably because the guys just are too dumb to fill the correct info. Why does anybody types US if it's a US Document? Place of birth is the City within the country.
EDIT: US you would type when asked for nationality or country.
It's not that easy. In Thailand the laws or rules are "bendable". Try to find something written down on Immigration Website they're arguing about here. You won't find the "rules".
having a house book or work permit or anything else what certifies your address might work as well, but in general a certification of your residency is required.