Wrong distance radius

[stoppiNeobiz]

Hi, ive a problem with the plugin, ive this code:

geo = Geoflutterfire();
    GeoFirePoint center = geo.point(
        latitude:45.5797169, longitude: 9.2408815);

    stream = radius.switchMap((rad) {
      print(rad);
      var collectionReference = _firestore
          .collection('locations'); 
      return geo
          .collection(collectionRef: collectionReference)
          .within(center: center, radius: rad, field: 'position');

the center is Milan, i've create other two point near Milan, the problem is that I have to increase the radius to 200km to get the marker out, when in reality they are at 2km and the other at 10km at most

[Dabugger]

Please use STRICT MODE = TRUE

geo.collection(collectionRef: collectionReference).within( center: center, radius: rad, field: 'position', strictMode: true);