Hi 4000 big face,
As part of the hotosm-project-17520_AndhraMapping24 project, you are supposed to work in the Andhra Pradesh region but you have added buildings in the Indiana/Detroit border region in the USA which is incorrect.
As per the wiki guidelines, building polygons should be orthogonalized while capturing as per reality and no redundant nodes should be present on the building polygons.
I have made the corrections.
Happy Mapping!!!