Hi,
You have removed the building tag from https://www.openstreetmap.org/way/280529501 (and replaced it with leisure=horse_riding), but it looks like a building on Bing. If the "Hippisch Centrum" is larger than this building it would be better to map it as a separate object (node or area, example: https://www.openstreetmap.org/node/2836753839).