Hi,
Riding arenas like https://www.openstreetmap.org/way/1235589166 are usually tagged with leisure=pitch instead of leisure=sports_centre. Compare https://wiki.openstreetmap.org/wiki/Riding and https://www.openstreetmap.org/way/1089803550 (example).
I am not sure what all the other areas that you have mapped and tagged leisure=sports_centre + sport=equestrian are, but they don't look like sports centres.