Hi,
It seems that you have choosen a wrong tag for https://www.openstreetmap.org/way/998278249 because this looks like a building and leisure=horse_riding is not a tag for a building. If this building is an indoor riding arena, you can use https://wiki.openstreetmap.org/wiki/Tag:building=riding_hall .

BTW: https://www.openstreetmap.org/way/1283722837 looks like an outdoor arena and not like a building; in this case it should be tagged with leisure=pitch + sport=equestrian .