What is unusual about your question is that you are suggesting different apps, google maps PWA, Magic Earth, organic maps are all getting the wrong answer.
Without going into the conversation too much did you try the app GPSTest.
If the device has a GPS hardware issue I can imagine the software coming up with a best “first guess” assuming “live data” will arrive soon. Mobile carrier triangulation is certainly a significant part of the equation, in one #gps thread a lack of fix was actually put down to the carrier: Location doesn't work later modified to: Fix to not working location
In my case GPSTest never gives better than an “amber” fix. In this case, with Magic Earth, I expect that the gps data is given a relatively low priority perhaps until verified. I think I always found the device comes good in 24 to 48 hours of active outside use, so this seems different from your question.