Force the route to recalculate on your Nav V this usually resolves the issue.
Go into the Route on your Nav V by selecting it in Apps - trip planner - select route - in the top LHS select 3 bars -scroll down to route preference - change to shorter distance - once recalculated - back arrow check the Map in RH pane, this should remove any straight lines and your route should look exactly as you intended.
Then do the same again in the top LHS select 3 bars -scroll down to route preference - change back to Faster time.
When you switch it back to faster time the route stays corrected. Yes its a faff but it does fix it and only takes a minute.
