Hi, you made edit with OSM Relatify. This tool duplicate ways, e.g.  https://www.openstreetmap.org/way/1342736599, https://www.openstreetmap.org/way/1342736600, https://www.openstreetmap.org/way/1342736601, https://www.openstreetmap.org/way/1342736602, https://www.openstreetmap.org/way/1342736603