Hi,
https://www.openstreetmap.org/way/1298119563 was correctly tagged as a riding arena (pitch + equestrian) and you retagged it; but it is not a complete "horse center" (see https://wiki.openstreetmap.org/wiki/FR:Tag:leisure=horse_riding).  If the riding arena belongs to a horse center you can map this horse center as a separate object (node or area), example: https://www.openstreetmap.org/way/767569060