Hi, I think you have used the tag leisure=horse_riding incorrectly. There are certainly not 8 riding centers in the small area covered by this change set. Please have a look at the related wiki pages and examples of how this tag should be used:
https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)
https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dhorse_riding
https://www.openstreetmap.org/way/906634102 (example)