FB logged in device can’t be remove

Simple is that to change your password and avoid hacking.
 
just change your current password it will log out old devices automatically or it is just a temporary display error
 
The device is too old, it is no longer important, rest assured
 
you log out of the old device because Facebook does not allow deleting the old device. then you are re-entering and reporting forgot password and then deleting everything you do not need.
 
Try logging out of your device and then changing your browser. I think you should change your password and log out of all devices. If you still have the problem, you can report it to the Facebook team.
 
the problem is from FB algorithm, there's might be an error. Log out, delete all the cache, login again. If it doesn't work, contact FB support team.
 
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