You have a rogue access point. You take the bssid, and use the signal strength to locate said access point.
pip3 install access_points --user
On linux systems you might want to install nmcli (recommended) or iwlist:
apt-get install network-manager # Ubuntu
pacman -S networkmanager # Arch Linux
usage: access_point_tracker.py [-h] [-a] [-c] [-s] bssid
positional arguments:
bssid the bssid to track
optional arguments:
-h, --help show this help message and exit
-a, --all print all available access points
-c, --clear clear tracking line on each update
-s, --same hide same updates