Hi there, and welcome to OSM :) I was going through recent changesets in the Calgary area and came across this one. It seems you've changed building=house tags to semidetached_house. Note this tag should only be used in places where there are two separate residential properties in one building, otherwise known as a duplex. I doubt these houses are duplexes, so I figured I'd add this note to encourage you to double check this. Thanks!