This was working fine for me in Unity 5.5 and ORK 2.10.1; after updating to Unity 5.6 and ORK 2.11.2, the AI characters don't move properly on the grid.
I have the movement speed set to Walk, and yet they run (the player characters respect the walking speed). They'll keep moving until they hit something; if it's another character, they'll push that character a bit and gradually slow down (but dramatically overshooting their destination cell). If they hit a static object, they'll keep moving against it.
However, the grid thinks that they are occupying the cell that they are supposed to.
Did anything change in 2.11.2 that requires other grid-related configuration to change? I'm not sure why the player characters behave properly but the enemies don't. I did check the "Move towards target" Battle AI and I've tried setting the target cell to Nearest, Front, Right, etc and it doesn't make any difference.