When using a shapefile exported from Pathfinder Office, there is no spatial reference information associated with the file, even if a projection was defined in Pathfinder Office.
Pathfinder office does not associate a .prj file to the shapefile upon export.
Define the projection of the shapefile in ArcMap to match the projection of the data in Pathfinder Office. This can be done with the Project (Data Management) geoprocessing tool.
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