Hi,
it looks like you have split one riding centre into four here:
https://www.openstreetmap.org/way/1392097834
https://www.openstreetmap.org/way/1415929062
https://www.openstreetmap.org/way/1415929063
https://www.openstreetmap.org/way/1415929064
I don't think this was a good idea. As explained on the wiki page for the leisure=horse_riding tag, this tag should be used for the entire riding centre once and not for all the objects that belong to it. What you have mapped now and tagged with leisure=horse_riding looks like riding arenas and round pens (https://www.jhrc.co.jp/images/gallery1.jpg) and should be tagged with leisure=pitch + sport=equestrian instead of leisure=horse_riding.
Compare
https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)
https://www.openstreetmap.org/way/580524439#map=18/35.986371/139.617027&layers=P (example)

In JOSM you can use the preset for sport=equestrian to tag riding arenas.