Please check the most common GIS errors by reading this article. If the problem persists, it might be:

• The GeoJSON file doesn’t contain projection information. If that’s the case, make sure each file contains it (e.g. "crs": { "type": "name", "properties": { "name": "urn :ogc: def :crs: EPSG::2326" } }) and try again.
• The coordinates don't match the projection information. We recommend opening the files in your GIS software, such as QGIS or ArcGIS, assigning the correct projection and resaving the files.

If the problem persists, contact us.