Hi,
Isn't https://www.openstreetmap.org/way/1183912900 a riding arena/ring? It looks so on Bing. But you have tagged it as a riding center (leisure=horse_riding).

Similar case: https://www.openstreetmap.org/way/1103528823

Compare
https://wiki.openstreetmap.org/wiki/Tag%3Aleisure%3Dhorse_riding
and
https://www.openstreetmap.org/relation/10345217