Thank you for reaching out! I know I would be concerned about a device on my network that I do not recognize. Here is a link: https://comca.st/3pDaOnA to see how to manage and remove registered devices. If you feel that someone is using your network you should change your password (learn how to with the link: https://comca.st/2ONzywA.) I would also suggest to report this to our Customer Security Assurance. You can contact CSA by calling CSA Toll-Free Number: 1-888-565-4329.
As far as the lap top that is not showing to be connected, have you tried to forget the network and then try to reconnect? Are you getting any errors other than 'non connected' in the app?