Sorry I never got back to you on this. Originally, you changed addr:street from "South 200 East" to "200 East". Typically when rendering an address, OSM data consumers will do addr:housenumber + addr:street. Since housenumber is (correctly) 15, it makes sense to have the full street name, including "south" prefix, so that it's rendered as "15 South 200 East" instead of "15 200 East". Hope that makes sense! And sorry for the delay.