There is an Update Prior To Sale for 2014 Sport and Range Rover, titled "Map Routing", campaign # Q358. Don't know what the service bulletin is about and how many vehicles may be affected (I don't have a valid subscription to TopiX to view this document, can only see the title), but it may be worth checking with your dealer to see if your VIN may be included in such campaign. They may have a fix for your crazy routings.
Also, if you have TMC (the traffic monitoring thingie) enabled, try disabling it in your settings. It may not attempt to reroute you around traffic, but your satnav will suddenbly appear to be a lot smarter as a result.