Since the last patch (or possibly after I upgraded the plot pole to level 3, both happened at about the same time) I've noticed that probably about half the walls and floors in my base are no longer registered with me when I go to move or deconstruct them. The same has happened with my playing partner and the walls he put up in our base. Some work, some don't. Walls that I know I put up and have moved many times before. Very strange.