What happens is that for some reason symmetry is corrupted here
This is top part of ship pay attention to blue line.
http://i.imgur.com/rBk2Btu.jpg
Now check bottom (symmetry goes through the middle of the ship)
http://i.imgur.com/GNgpN5U.jpg
As you can see there are randomly placed blocks that must not be there.
I've just started but if that will become serious issue i will have to wait till update, because its impossible to build such projects with such bugs.
This is top part of ship pay attention to blue line.
http://i.imgur.com/rBk2Btu.jpg
Now check bottom (symmetry goes through the middle of the ship)
http://i.imgur.com/GNgpN5U.jpg
As you can see there are randomly placed blocks that must not be there.
I've just started but if that will become serious issue i will have to wait till update, because its impossible to build such projects with such bugs.