Hello everyone..
Privacy and safety is the most important thing on internet these days and i would like to give you a hint about keeping it all safe.
Ive recently noticed theres an unknown device in my google-play devices list. Have no idea how it was appeared there ; it even shows the cellphone carrier from another country. Checked some forums to delete this device from this list but all the information there is just to de-list that,which is not a solution at all just to make it unseen in the list..
Finally achieved to solve the problem though after a while. Now im gonna tell you how.
You shouldnt do that from google play site since theres no such option there
Just enter https://myaccount.google.com/device-activity
Click on the device which you want to delete.
Then click on remove
And voila!
This option seems like the only one to fix the problem
STAY SAFE