Why does map from geojson have duplicate layers?

Question

When I click the "open in mapviewer" for this geojson item, I'm presented with a map having duplicate layers.

http://futura.maps.arcgis.com/home/item.html?id=b2dad70db19a4960a8a5b1227dcb4907

Anonymous User · Answer

Ok, that produces what I expect, no duplication.

Occasionally I'm able to get it to misbehave if I double click real fast on the Open In Map Viewer

Thanks, Kirk

KellyGerrow · Answer

I was able to open the layer up with just one layer. Maybe this was added to an existing map. Try clicking open in new map when you open the feature layer to ensure that you are starting on a fresh new canvas.

Thanks,

Kelly