This has happened in several different games now, and several different houses. A sim comes to visit me, walks in to the house, and then knocks on the door. If I click on the sim, I get the option to "invite in." Is this a bug, or am I doing something incorrectly? I reversed the door in build mode thinking maybe there is a true front and back side to it, but it still happens. Is this user error? It isn't really impacting game play, but it's so goofy!