This happens to me as well. Furniture that require to be placed accordingly in order to be functional, appear buggy.I don't think its just proudspire. I wonder if something was changed. I don't know, but I am getting really weird behavior when placing furniture.
I was placing two identical chairs yesterday in an open area. One placed normally and had the green outline, the other would not turn green regardless of what I did. I started trying to place it anywhere, even in mid air for a green and nothing.
I put the chair away, got it back out and tried to place it and it worked as expected.