Hello, and welcome to OSM.

Thanks for adding addresses.

The typical mistake people do on their first day is tracing buildings on aerial imagery.  You may have noticed that those images are distorted.  They should never be used as a source for buildings.  Instead, we always trace buildings from numerical imagery (Digitaal Vlaanderen GRB for this part of Belgium), which shows the official outline.

Also, when a single building has multiple addresses, the best way to map them is to add floating nodes, one per address, instead of artificially breaking the polygon into multiple blocks.

I fixed your edit here.

Have a nice day.