I adjusted the grid and offseted (is there such a word?) the wall,shadow and grid layers.I think the problem is partially solved.Sometime I'll try out using a small bevel.
Also I was experimenting with gradients and lighting effects for the stairs.I'm happy with the gradients but I might change the shadows for each different step.
Finally the map has gotten a few tones darker because the illumination is supposed to be darkness.Please tell me if it looks too dark and I found a collection of many statues so my life has gotten a lot better.

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