All you can do is to change your password once again.
Monitor the ip list and see if it grows again.
If it does after the password change then it points to internal and not external.
* Is there anything in the logs ?
* I would be freaked out to.
The only other thing i can think of is years ago using Tabs in FF it presented strange things on the screen to me.
Even after CTRL +F5 many times. After a restart of the PC i was seeing what i should be seeing.
Meaning that because i had tabs open for days at a time, i was seeing strange things too.
Mine was not in the IP list i cant remember what it was now but it had me going in circles for over a week.
