I checked again. The ways in the editor are aligned with the satellite image and the gps traces.
Only the rendered tiles show the old location which I corrected today.
I also changed the roundabout from highway=unclassified to highway=trunk

Hm, I used the MapBox satellite images.
The shape of the feeder matches the image better than the gps traces.
Usually I like using the gps traces. This is strange.