I see. Maybe you can try adding an additional event with Pathfinding - On Arrived to snap to your target.
Another approach I would try if you need clear steps on your grid during the movement is to set up your own custom movement. Use the pathfinding node expressions to pull out the path the behavior found (maybe into an array), and translate the coordinates to snap to your own grid size (by rounding). Then with the custom movement behavior, set the desired step size (to your grid) and move towards each waypoint/node in succession.