Hello, and welcome to OSM.

Please do not change the outline of buildings. It looks like you changed the shape of houses by tracing them on… aerial imagery.

Aerial imagery is not suitable for buildings or tall structures in general; this image is distorted and we won’t move every house every year.

The correct reference for buildings in Belgium is the numerical imagery provided by governments.  In Wallonia, this is PICC numerical imagery.  Please use this for houses.