My data table only has zip codes in Michigan and Indiana. When I map these zip codes in Esri's ArcGIS desktop software, the display is correct. When I map the customers by zip code in PowerBI, I see zip codes in Montana and other states where I know that there is no data. When I map the customers by county ID, the map is correct. When I map the customers by latitude and longitude, all of the records are in Michigan or Indiana. The problem seems to be specifically related to how PowerBI is interpreting the US zip codes.