Is that why when sometimes I load my builds, they load like the bad picture you showed with you loading demo house in the wrong direction?
No, read the description for the messed up demo house.
Once you click the load button on the gui, you are committed to that direction. The load has adjusted all weird bricks to work exclusively in that direction. After loading, you should then replace your brick directly in front of you to make sure it is in the same direction you are.
What you should not do:
Load a save, then go and face a different direction
Place the brick you are about to load with, then go and face a different direction
Face the direction you are about to load in, but then rotate your starting brick to a different direction