We have been seeing several inaccuracies in geo location with Filled Maps. Things that work in Bing Maps, not working in Power BI. For example, zip code 21013 is near Baltimore and correctly located in Bing, but power BI places it at the centroid of the USA.
In addition, Power BI doesn't do as well with noise in the the address, like a company name, whereas Bing handles that. I thought they were driven by the same engine.