facebook account

I have a problem with my facebook account, I am a phone user and a few weeks ago I logged out of facebook, but when I tried to log in again, it started to show me an error that does not allow me to log in, I tried it on other devices, but no I can do it anywhere.

Hi all, new here but hope someone can help, I received an email from Facebook to say "did you just log in from a new device from Leeds" (I'm in Cambridge) I very promptly then changed my password within 7 mins of receiving the email, when I then went to log in with the new password it said my...