Hi,
You have retagged the building to a riding centre (tag leisure=horse_riding). I think that this was not a good idea. Each building should have a building tag, otherwise it will not be rendered as a building on the maps. If the building is an indoor arena you can use building=riding_hall and the iD editor has a preset for that.
The tag leisure=horse_riding is for a complete riding centre (not for just some of it's buildings); in this case it is represented by https://www.openstreetmap.org/way/351529199 (Colraine Equestrian Centre) with leisure=sports_centre + sport=equestrian, which is an alternative tagging. 

Related:
https://wiki.openstreetmap.org/wiki/Tag%3Aleisure%3Dhorse_riding
https://wiki.openstreetmap.org/wiki/Tag:building%3Driding_hall
https://www.openstreetmap.org/way/1008067851 (example)