They are not actually upside down. With a ledged and braced door, the brace on the door should start at the hinge side on the bottom and so if you turn it over it will still be on the wrong side. However if you swap the left and right hand doors over they will be right.
I don't know how you lot have time to do any modelling. Every time I look here there are another three pages to catch up with.
Keep it up.
Dave