Any traveler only ever occupies a single cell of the A* grid at a time. The size of the traveler (or any objects inside of it like the gurney) is not taken into account.
You use a very fine grid with a spacing of just 10cm which allows the staff to travel alongside the divider very closely, resulting in the staff and gurney object overlapping the divider.
You could force the traveler to stay farther away from the divider by adding additional barrier objects to the model.
The fine grid spacing also means that staff can essentially pass through each other, since they only need an offset of 10cm to move "past" one another.
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