Whenever I move or manipulate some walls in the building I'm making, they will vanish, with the 'smoke' animation, then reappear nearby at 90 degrees.

I did think that this was due to me being quite far from the centre (asked on reddit here https://www.reddit.com/r/RecRoom/comments/bglmyy/custom_room_shapes_despawning_moving_for_no_reason/ ) but I moved everything back and its started again. I have plenty of ink left.

I do have snapping etc. on so I wonder if that matters. They align when I 'drop' them fine though. Also, in the reddit link I say it takes 15 seconds, but sometimes it is a lot quicker.