Trying to use platforms on the second floor brings the roof inside

No matter what I do, I cannot get platforms on my second floor to work. I've tried redrawing the room before I place one, I've tried using the room tool to make a platform and then deleting the walls, I've tried placing the platform in the middle of the room first , nothing works. Every time I try to place a platform the roof comes inside the house and it's incredibly frustrating. Has anyone figured out a way to make them work on upper floors? Is this something EA needs to patch and just hasn't? This also seems to happen if I try to use fences or half walls on the upper floors as well. Sometimes my game crashes when I try to use platforms on my first floor, but I don't think that's related to the roof issue, I think that's because I cheated the platforms I have outside to meet up with my foundation without having a foundation of their own. But who knows