Hi hhrazaka,
this changeset has created errors in the OSM database regarding self intersection lines caused by an not propperly edited bus line:

https://tools.geofabrik.de/osmi/?view=geometry&lon=7.73432&lat=48.59240&zoom=15&baselayer=Geofabrik%20Standard&overlays=self_intersection_ways%2Cself_intersection_points%2Csingle_node_in_way%2Cduplicate_node_in_way

https://overpass-api.de/achavi/?changeset=159927161

Can you please fix this?

May be you like to educate yourself about how to edit bus routes correctly:

https://wiki.openstreetmap.org/wiki/Buses

Kind regards
Guido
