Hi,
You have mapped a horse riding center (https://www.openstreetmap.org/way/1356007052) inside of another one (https://www.openstreetmap.org/way/810566960). This makes no sense (to me). Additionally, it seems to be a building but lacks a building=* tag. Therefore it is not rendered as a building. If this object is an indoor riding arena you can tag it building=riding_hall instead of leisure=horse_riding (like here: https://www.openstreetmap.org/way/924645249#map=17/57.788909/14.111676&layers=P )