User DoubleA is quite active in deleting the tag highway=bus_stop. It is messing up the regular bus stop updates, creating hundreds of duplicates. After I spent a few hours fixing it today, DoubleA deleted highway=bus_stop again. He is not responding to changeset comments so far. I think next step is to report the matter to DWG, if the user keeps deleting the tag.
Example: Changeset: 140328270 | OpenStreetMap