Hello,

Despite it is common to say "cobblestones" in normal language, the OSM database makes a clear distinction between ordinary stones and small blocks used to build roads.

"surface=cobblestone" is exclusively for raw stones laid on the ground, still found on ancient Roman roads, i.e. https://wiki.openstreetmap.org/wiki/File:Ancient_road_surface.jpg

"surface=sett" is for those typical stones carved as small cubes: https://wiki.openstreetmap.org/wiki/File:Granite_Setts.jpg

Real cobblestones are hardly found at all in Western countries.  The "kasseien" everybody hates are coded as "surface=sett" in OSM.

Would you please review your change and make sure that if you use "surface=cobblestone" only if you found one rare occurrence with raw stones.

Happy mapping.