Okay, I think I may have an answer for you. By saying "Going the wrong way", I assume you're looking at the route and saying it's going East instead of South from point one.

Using your location, it's taking you out on GreenBelt Rd instead of navigating through the side streets. For that matter, it could take you out on Greenbelt going the other direction to Cipriano.

It's using the quickest route instead of the shortest route.
To change it, go to tools/More Options. Click on segments, and choose "shortest".

There is some fancy math going on behind the scenes to figure this stuff out. For an exciting Friday night, Look up "Travelling Salesman Problem" in Google, and read away. (Okay, maybe not exciting...you can also look up some graph theory stuff, but it's a little out there.)

Hope that answers your question.