Hi,
the 2 areas mapped here are not horse riding centres (leisure=horse_riding), they are horse riding arenas and should be tagged like https://www.openstreetmap.org/way/1223815764 (pitch + equestrian).
The horse riding centre here is probably https://www.facebook.com/StajniaMazuryLesne/ and can be mapped as an additional obkect (node or area). See also https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian) and https://www.openstreetmap.org/way/1001549483#map=18/52.233468/20.128291&layers=P (example)