GoogleMap Marker icon issue in renderer

I'm making renderers in my project, so that the PinType enum will actually have an effect by changing the color of the pins. But whenever I use a non-default icon for the native Marker, it draws as the default icon on top of my icon, with the default disappearing on click.

Here are some screenshots from using marker.SetIcon(BitmapDescriptorFactory.DefaultMarker(BitmapDescriptorFactory.HueGreen)):

Image may be NSFW.
Clik here to view. Image may be NSFW.
Clik here to view.

And here are some from using marker.SetIcon(BitmapDescriptorFactory.FromResource(Resource.Drawable.ic_launcher)) (my app icon):

Image may be NSFW.
Clik here to view. Image may be NSFW.
Clik here to view.

And here is my renderer code:

[assembly: ExportRenderer(typeof(ExtendedMap), typeof(ExtendedMapRenderer))]
namespace eLationTechnician.Forms.Droid.Renderers
{
    public class ExtendedMapRenderer : MapRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.View> e)
        {
            base.OnElementChanged(e);

            if(e.NewElement != null)
            {
                UpdatePins();
            }
        }

        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            if(e.PropertyName == "Pins")
            {
                UpdatePins();
            }
        }

        private void UpdatePins()
        {
            NativeMap.Clear();

            foreach(var pin in Map.Pins)
            {
                var marker = new MarkerOptions()
                    .SetPosition(new LatLng(pin.Position.Latitude, pin.Position.Longitude))
                    .SetTitle(pin.Label).SetSnippet(pin.Address);

                float hue = 0.0f;
                switch (pin.Type)
                {
                    case PinType.Generic:
                    case PinType.SearchResult:
                    {
                        hue = BitmapDescriptorFactory.HueRed;
                        break;
                    }
                    case PinType.SavedPin:
                    {
                        hue = BitmapDescriptorFactory.HueGreen;
                        break;
                    }
                    case PinType.Place:
                    {
                        hue = BitmapDescriptorFactory.HueBlue;
                        break;
                    }
                }

                marker.SetIcon(BitmapDescriptorFactory.DefaultMarker(hue));

                NativeMap.AddMarker(marker);
            }
        }
    }
}