Oh my! That must be a bit off settling for you! I am not sure, maybe the angled ceilings are something they have to adapt to? Don't have much advice to give, but if it were me. I would take them one at a time , have them perch on my hand, and slowing walk around the room, near the angled ceilings slowly, so they can see them or even tap them with their beak if they so desire, all the time, explaining to them . something like " look funny wall" maybe run your hand on them so they can see the difference? It might just be throwing them off cause it's new, sometimes angles are difficult to see. I tend to do that with one of my greys as we walk around the house, saying look up high! I stretch as far as I can just to give her a different view even tho she can fly, she can't quite go as high when flying vs being carried.
Let us know how it goes, keep us posted!
One afterthought...Will they try to land on you if you call them? Just an idea.... or some soft comforters/ blankets on the floor for the time being?