Post man keeps looking in windows

Every week or two the post man will have a look in the living room window to let me know he’s dropped off a package. He doesn’t bother pressing the door bell, just has a look in the window and points to where he’s left the package… have I gone mad or is that really weird?

One time I answered the door as I saw he was dropping off a package and he commented on the clothes that needed folding in the living room.