Uhm maybe just adding Category: isn't enough. Here for example:
https://www.openstreetmap.org/node/35879657

you added =Bonn, but this would be the commons category of the city. It should be =Category:Bahnhof Siegburg/Bonn
could you check it out?

another option is just to delete the wikimedia_commons=* tag since it can be retrieved already from Wikidata