It can happen that two devices side by side show slightly different location. This is due to several factors like positioning of the devices, but also past locations. It can be especially visible if the signal quality is not the best or accuracy is ok, but player is close to tall buildings.

It is normal, and unless it affects your gameplay it is nothing to worry about. If the anomaly is large (10 meters or more) then you should check if the location is suitable for the task.