Interesting bug today. I loaded a route to climb Les Deux Alpes in France and it gave me directions for another of my routes in South West London in the UK. I wondered why I was constantly being directed to my local park. Had to remove the cached version and recalculate once I realised. Not seen this before.
Notice the blue line showing where I have been, the dark purple line above indicating part of the route I was yet to cover, and the light purple line with chevrons on the right hand side, which was part of some other route I did a while back.