Hi,
I have had this today on an official server, I placed a wooden box down and it was fine then I tried to place another close to the first one and I had the view obstructed.
The thing with this though there was no foundations, no walls, and no ceilings, it was out in the open.
I have found that sometimes it is to do with how close you are to the object being placed and other times it seems to be where you are placing the object.