text: The boundaries here have been drawn as fences that cross straight across the houses. They're not quite lined up with the party walls between adjacent properties. I also very much doubt that people have fences inside their properties! So, an OSM data issue. Looking at the timing of the addition of the data, the houses were mapped first, then the fences were added afterwards without tweaking alignments between the two. When comparing with the Land Registry polygons layer offered by OSMGB, it looks like the alignments of both the buildings and the fence lines are slightly off.