It is OK, if you want to outline the thickest part of the building, but it must be positioned where it is on the ground (or where it vertically projects onto the ground), not where its roof is shown on the aerial imagery, which is taken a bit from the side (rarely from exactly above the building). So tall buildings are always slanted or skewed to the side and you must take this into account, cross check with neighbouring buildings or with the cadastre map, which has the buildings properly positioned.
I will fix this.