Hello, I only have removed duplicated buildings - it means that the same buildings were duplicated in the same place. You can see that I removed two buildings https://overpass-api.de/achavi/?changeset=160694498 and the buildings (in the same place) are still on the map https://www.openstreetmap.org/way/1331702926, https://www.openstreetmap.org/way/1331702927