FYI: OpenStreetMap seems to be blocking the site with a 403 error (suggesting maybe it's pulling too much data from OSM's servers?): https://wiki.openstreetmap.org/wiki/Blocked_tiles

Open street map servers aren't really meant to be used in end user applications. They are primarily to support the editing of the map data. Usage like this should be with a provider like Mapbox, or your own supplied tiles.