There was already existing object (fence) for this area. So I removed the duplicated one and moved its tag to the old one.

Always better to carefully check if an object is already added, then update it accordingly, instead of duplicating.

Also use local photo-maps, those often have better quality and coordinates. That new area was placed partially on the street.

If an object you want to add doesn't match positions of any nearby objects - then it's a good indication that used photo-map may not be positioned correctly.
You can also check last edits dates, if nearby object were recently edited then almost for sure there is a better photo-map available.