It's called GPS drift and it is usually caused when your phone can't latch onto a strong GPS signal while indoors. The quick fix is to turn on Wi-Fi, or to get close to a window, which will
Enable GPS. To start fixing the Pokemon Go GPS problems, we will need to check everything from the basic levels. So, as we know the game uses GPS to know your location, there are chances that GPS on your device is not On.PxTtWi.