Chrysopras
Thank you very much for this hint!

Well, the name should be „Kelterbuckel“, that’s right, but it belongs to the picknick site right beside the road, not to the road itself. “Kelterbuckel Grillplatz” just means something like “Kelterbuckel picknick site” in English. ;–)

Therefore I have removed the wrong name from the road/track and added “Kelterbuckel-Grillplatz” as additional name to the picknick site (https://www.openstreetmap.org/changeset/60002053). So, I think, everybody should be happy.