the shop is named "HORNBACH" here on osm and this is somehow connected to wikidata and therefore the iD editor discourages from changing it. On the other hand, names should be lowercased as with the other Hornbach in Dresden and in this discussion https://forum.openstreetmap.org/viewtopic.php?id=62452 and in the brand list https://wiki.openstreetmap.org/wiki/Brands#Hardware