I had quit and restarted the game before I remembered to screenshot
So I had Mist at node 4 (Power 677) between Sir Roostley and Melendor. I gave her 2 extra nodes to power 687 but she didn’t move automatically to her current position in the above screenshot. Instead she remained in the position behind Sir Roostley (Power 683).
I had to quit and restart for Mist to move to her correct position. Also, this is the second time it’s happened. I can’t remember the former hero.