This should hopefully be resolved by the following changeset: https://www.openstreetmap.org/changeset/154239323 .

The hospital grounds are now a multipolygon. 

The address that was on the area to the east was already mapped via some nodes and only applies to that portion of the grounds, so it was removed. 

Both healthcare=hospital and amenity=hospital were kept. See here for why: https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dhospital#Relation_to_healthcare=hospital_tag . 