Facebook Security Question?

[anon]

Recently, my facebook has been showing active sessions from Texas and Indiana, but I live in neither of these states. I know that this problem can be due to using a mobile device because the IP address is approximated, but I don't use a phone for anything internet related. So I'm concerned that it is a hacker, but not sure because when I log in on my own computer facebook says that the current session is from Texas. I change my password frequently and end all of the suspicious activities. Anyone know what might be going on or if anything else needs to be done to solve it?