I doubt that having the other two countries' mapping data loaded is what's causing the weird routing. More likely it's because you have one or more avoidance checked under "Navigation" or there's some other truck-centric setting enabled causing your problem. If that's not the case then hard-resetting it will likely clear the problem but be aware that will remove all history and favourites: [Only registered and activated users can see links. ]. Sometimes it's necessary to additionally clear the non-volatile memory if a hard reset doesn't work: [Only registered and activated users can see links. ].