Thanks for contributing to HOT OSM. If you want to create a round building, select the building and press the 'O' key. I hope this helps.
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Published using OSMCha: https://osmcha.mapbox.com/changesets/63641877

Thanks for contributing to HOT OSM. One small thing. Square your buildings. Do this by selecting the polygon and pressing the 's' key. Does this help?
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Published using OSMCha: https://osmcha.mapbox.com/changesets/63641879