I had this problem happening to me the other day...it was really annoying. Are you using the Facebook for Android app? If so, then follow my steps to get this problem eradicated. Step (1) Log into your Facebook account via desktop/pc version. Step (2) Request a password change (your password has somehow been compromised - doesn't necessarily means that it was hacked). Step (3) Uninstall/reinstall any Facebook application you're currently using (it's better to use the facebook for android application). Step (4) Sign into your Facebook account and enjoy! You're welcome.
