links missing on map

[dangowrt]

I've installed luci-app-owm in our local OLSRv1 (IPv4) mesh network here in Neot Smadar in Israel.
The nodes also show up on the map and that's a great step forward already.
However, though the OLSR links are part of the JSON dataset, they are not shown on the map :(
Sometimes it seems like some lines show on the map when hovering over a group of nodes, but as soon as zooming in to see them individually, also that doesn't happen any more.
What's wrong?
See for example https://openwifimap.net/api/db/WR841-2.arig