Hi,
You have removed the tag building=yes from
https://www.openstreetmap.org/way/186455386
https://www.openstreetmap.org/way/186457318
https://www.openstreetmap.org/way/186459012
https://www.openstreetmap.org/way/186458264
and replaced it with leisure=horse_riding (riding centre). This makes no sense and has caused the buildings to disappear from the map. Every building should have a building tag. For special types of buildings you can use
https://wiki.openstreetmap.org/wiki/FR:Tag:building=riding_hall
https://wiki.openstreetmap.org/wiki/FR:Tag:building=stable
The the tag leisure=horse_riding is indended for complete riding centres and not appropriate for these buildings that are only a part of a riding centre, please read
https://wiki.openstreetmap.org/wiki/FR:Tag:leisure=horse_riding