Hello there,
Are you using any VPN?
Windows uses wifi mac addresses broadcast by nearby Wifi routers. If you or someone in your immediate vicinity has moved into the area recently and your WLAN card can detect their access point (regardless of if you are using a wired or wireless connection) then it could determine the last updated location of this.
Similar discussion here https://answers.microsoft.com/en-us/windows/forum/all/fixed-wrong-location-detected-by-windows-cortana/a111b93a-f068-430e-ab54-b123ebeb0742
Hope this resolves your Query !!
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