Hi marinatoporova, welcome to OSM.

May I know the reason behind deleting several mapped service ways? Thanks.

See http://overpass-api.de/achavi/?changeset=56660437

Hi rusefkuma, welcome to OSM.

Could you please don't delete and redraw more or less the same objects? This deletes the history. See osm.wiki/Good_practice#Keep_the_history

More information about your changeset: http://overpass-api.de/achavi/?changeset=56642299

Hi ALPZz, welcome to OSM.

What is the source of the mapped buildings in this changeset? Other contributors already removed some of your maybe "imported" buildings...

See changeset/56640189

More information about this changeset here: http://overpass-api.de/achavi/?changeset=56610762

@TomDeKanter, thank you very much for your answer.

So we should ask the contributor who created or maybe "imported" the buildings?

I'll create a comment here: changeset/56610762

Hi TomDeKanter, welcome to OSM.

May I know the reason behind deleting many buildings, which have been mapped yesterday by a different contributor? Thanks.

See http://overpass-api.de/achavi/?changeset=56640189

Hi stellar1jd, welcome to OSM.

Please only map what's on the ground. Don't add fictive map data, that's #vandalism ! Thanks.

See http://overpass-api.de/achavi/?changeset=55911537

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism

Can someone please revert this? Thanks.

#vandalism