astar' AI falls down, doesn't follow the grid

I have a maze level where AI should follow a player if it sees it and instead of walls I have free space so you can fall down easily. I use Aaron Astar Pathfinding project, so Grid Graph covers walkable area and Seeker + AIPath attached to the AI. Basically, every time AI sees and chases me he falls down from the trail on the corners like he wants to use a shortcut. Does anyone know how this can be fixed?
Thank you.

Untick the box that says ‘Cut Corners’ under your graph settings. That should do it.

Also, I advise you to ask directly on Aaron’s forums as he is very helpful and will answer in a couple of days at most.