@Karla-and-Eric0 the ability to figure out where a person is logging in from is not perfect, so don't expect it to always get the location right.
However, it generally won't mistake a login from Malaysia, Singapore, Turkey, Pakistan for login from the USA.
Don't forget: if you re-use the password you use for AirBnB anywhere else, you should change it there also.
By the way: given that there are many, many ways a person can compromise someone's username/password, why do you automatically say "what is going on with the AirB&B security???"
The most common attack vectors are attacks on the security of a home user's computer (where the security is very low).
Is there something that leads you to believe there was a breach in the security of AirBnB's systems?
(Note: I don't know either way. I just thought it was a funny conclusion to reach, given the high percentage of home computers with known and exploitable security holes.)