Hi,
The areas that you have mapped as riding centres (tag leisure=horse_riding) don't look like riding centres. They seem to be riding arenas; and in OSM riding arenas are usually tagged leisure=pitch + sport=equestrian. In JOSM the preset for sport=equestrian can be used to set these tags.

The tag leisure=horse_riding is for complete riding centres. Maybe you can add it to https://www.openstreetmap.org/node/2959353936 because this node has the same address like https://jk-niss.webnode.cz/kontakt/

Compare
https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)
https://www.openstreetmap.org/node/10779974921#map=18/49.55060/15.36583&layers=P (node example)
https://www.openstreetmap.org/way/945872752#map=18/49.51041/15.33283&layers=P (area example)