I have noticed this for a while and it does make a lot of builds frustrating. When you use the stairs block very often you cannot walk up them especially if they are used in any CV that is tilted at all regardless of gravity generator. Also if you stand on them you will slide all the way to the bottom. Thank you for looking into this.
It happens to me all the time as well. In space and on the ground as long as the ship is not flat with the universe. If I am I space I always try to hit the O button to bring ship level with the universe so then the stairs work properly. If I dont then I have to jump up the stairs or jet. It does not happen on a base as the blocks can only be placed into the universal grid so the stairs r never tipped at off angles.