There is a bug when you want to edit in any way a building piece before placing it when using a controller.
The bug happens when you try to rottate or rise/lower any construction piece before placing, when you click the button (default xbox controler RT) it will instead put you in combat stance and exit building mode. If you select a building piece already in combat stance, it will work normally.
Also, there is a bug that the building hints (buttons) are staying on screen even after exiting building mode. I noticed it with controller also, but this dosent goes away when building with the mouse, it goes away after some time, but I could not patter how it begins or disappears.