Probably not a high priority, but sometimes when I set my GPS to go to a new street, it points the opposite direction and then changes after I start walking or push the button to auto-walk. Doesn't seriously affect gameplay but sure seems buggy.
If there is a pattern that you think may set it off, do let us know; or give a very specific 'I was here on X Street and chose Y Street and it did it', in case it can be replicated by the exact route.