Hi @IgnaceEt there are some issues with your mappings.

Do not forget to make buildings with rectangular corners: draw buildings as accurately as possible, without the shadows, then type 'Q'.

A highway, a building or a border should not share nodes with each other or other features. When it happens accidentally, you can use the disconnect option ("D") in the iD editor to 'unglue' the nodes from each other (nodes that are shared are grey instead of white). To avoid it happening, hold the ALT key down while you are placing a node near another building, it will prevent nodes from snapping together.

Thanks for mapping. Next time, you can improve by avoiding mapping several buildings as one building. Every building must be traced separately. Zoom in as close as possible to see the outline of the buildings, hit each corner of the building carefully. Look for shadows, open ground, changes in roof color and vegetation to differentiate buildings.
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            #REVIEWED_BAD #OSMCHA
            Published using OSMCha: https://osmcha.org/changesets/164094207
            