New door

This is happening at the back of my house right now. Another house on the next street is being renovated rather extensively and the contractor had put up a new back door just a few days ago.

The contractor and his workers are at work today and the back door has been reopened. However, I noticed that this door had to be propped open so that it won't swing shut.

The first thing that came to mind was that the door has not been fixed properly.

If the door had been hinged correctly, it wouldn't open or shut on its own accord. It should simply stay open or shut, depending on how the user wants it. If a door can swing shut or swing open, then something must be out of alignment. I may be wrong but this is just my logical way of thinking on this matter....