First floor + wall near stair

The house on 17 june, first floor with the 2 windows is future office.


This wall is not correctly built(photo below), I think it supposedly 50cm higher but I don't know what happened, will ask to Tpalm about it, it's where we'll put the stair, if we let the wall like this than we can see the under of the stair, and it'll look uglyyy