Location 500 km off no automatic wifi connection

So i am testing the software for our company, and set the device to missing and moved to another of our shops.
In the options i turned on the automatic wifi connection and wanted to see if it would auto connect to our customer wifi.
well, it didnt. although it had no other internet connection.
the next thing is, the other shop i went to test it is about 300 meters from our office, but the detection said i was over 500km away.
the location triangulation is so far off its not even funny. i already tried every step in the FAQ several times and google instantly tells me exactly where i am, maybe a few meters off, but in the prey location its about 1,5 kilometers away from our office and in the shop its like i said over 500 km.
is there another solution to this than in the FAQ?
i was testing on a lenovo miix 320 ( no GPS ) Windows 10 with newest updates and the actual version avaiable of prey.