Hello.  A remark.
Here you mapped all (80) buildings over each other.
Please read the how to map information. 
 Is it possible that you don't zoom in far enough to get already mapped buildings into your view screen? Check the lowest line on your screen. When there is a blue piece which says that there are buildings  hidden, you need to zoom in till they are visible
Best regards.
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            #REVIEWED_BAD #OSMCHA
            Published using OSMCha: https://osmcha.org/changesets/139692486
            