Hello,
I think you misinterpreted one tag. You designated complete quarters within Istanbul as a pedestrian area. "highway=pedestrian" is a road or place exclusively reserved for pedestrians, see the explanation in the wiki: https://wiki.openstreetmap.org/wiki/Tag:highway=pedestrian?uselang=en.

Your mapping would mean that the whole area is one big square for pedestrians which is certainly not what you want.