Buildings that should be square are not mapped as such. Orthogonolise building footprints by pressing 'q' for buildings with straight edges. 

The highway intersects building footprints and shares a common node with at least one of them. Highways should not intersect building footprints (unless a tunnel or other such feature allows it) and should not share common nodes. Unglue common nodes shared by buildings and footprints by pressing 'g' and if the previously mapped highway intersects building footprints edit it so that it does not.
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            Published using OSMCha: https://osmcha.org/changesets/136220048
            