Yes, the picking up system is made to troll. When you pick up on object it automatically turns upside down. I have a genius idea: when you pick up an object, **drumroll** fix it to the upright position...
That would fix all problems. When have you ever thought, "Gee, I want to turn all my cups upside down today." ?
Oh well. I've found that just before you place it you should find something to roll it off of so that it can flip upright right before you place it (TWSS).

moment...I haven't bothered with decorating since.