I noticed this as well. A few times when I reloaded, my character would not get stopped in the hallway, and would walk to the position you mention, which is the final destination.
When my character did get stopped in the hallway, it looked like my character's movement was blocked by one of the NPCs taking up the next movement square for a fraction of a second too long, causing a collision stop on my character. Once the battle starts, you can take a step to refresh the vision in the room.
