The RIP sender sends RIP only to gateways listed in the encap table, unless a bug has surfaced that I wasn't aware of. That code has been stable for several years, so I doubt it.
Does that table contain only gateways that actually have routes to them? Or is there also a listing for those that only are registered in the portal but with "No subnets"? I wonder how those gateways know the route to us to transmit tunnel data when they do not actually route anything themselves? They appear to be MikroTiks so most likely running the script by Marius YO2LOJ and that would have to receive the RIP data to bring up the tunnels.
Rob