I have seen, that you have retagged all the buildings of the farm from building=* to leisure=horse_riding (https://www.openstreetmap.org/changeset/163505278). This was a bad idea, imho, because
1. a building is a building and not a horse riding centre
2. every building must have a building tag, otherwise it is not rendered as a building
3. every horse riding centre should be represented by only one OSM object (node or area) and not by multiple objects, see https://wiki.openstreetmap.org/wiki/Tag:leisure=horse_riding#When_not_to_use

For different kinds of buildings we have different building tags, e.g. building=stable, building=riding_hall, ...