This polygon is much too large for the region it should show (“Oberpullendorf”) and therefore a lot of places in nominatim are incorrectly assigned to this region.
How can I correct this polygon shown in the map? I wasn’t able to find it in potlatch or JOSM, any help how to do this would be appreciated.
For place= tags on nodes, I think Nominaton just has to estimate the area it covers. I think it uses the place tag, ie city covers a large area than town etc, plus what other areas are nearby. And its not always very accurate.
If you know the boundaries for this region, then draw a way (or relation) around it, and tag it as place=region, name=Oberpullendorf etc, and delete the node.