Hi I saw your edits on Taman Pertama. I'd like to tell you that the building is drawn wrongly as it doesn't follow the actual building outlines. Secondly, the building is tagged incorrectly with the layer being -1, which shouldn't be required if you do not draw the building incorrectly. Anyways, please refer to the wiki for any edits to avoid any mistakes: https://wiki.openstreetmap.org/wiki/Key:building

Thank you.