Hi iPappa,
this changeset has created errors in the OSM database regarding self intersecting ways:

https://tools.geofabrik.de/osmi/?view=geometry&lon=25.43240&lat=65.02811&zoom=14&baselayer=Geofabrik%20Standard&overlays=self_intersection_ways%2Cself_intersection_points%2Csingle_node_in_way%2Cduplicate_node_in_way

https://overpass-api.de/achavi/?changeset=137258240

Obviously you have shaped a forest into something rectangular. Can you please fix this?
Kind regards
Guido