Ekahau Pro 10.2 made offsets more visible with the latest update. By default, Ekahau Pro will load visualizations in a mobile offset.
Using offsets can be dangerous if you haven't compared the difference between the devices in question against the Ekahau Sidekick.
I believe offsets should not be used in a predictive model. The results of a design are not exactly the same as the real world results.
In this video, I show the differences of offsets in a predictive and validation.