The FAQ will tell you that you do not have a provisional rating until you have completed 5 games and it then remains a variable p rating until 20 games are complete. None the less if you look at any of your pgns for your games on this site it will show a provisional rating in the headers. Yours is currently 1655.
No mystery. A provisional rating is calculated as opponents grade + 400 on a win, -400 on a loss and = on a draw, averaged over the number of games completed. As he has completed one game the rating is simply his first opponent's rating + 400. The site starts the calculation at game one but does not choose to display it on the player profile until five games have finished - presumably to give a clearer idea how strong a new player might be. The pgn creation software simply takes the players ratings at the time of request and sticks them in the pgn header without reference to their provisionality. You could argue it shouldn't but since the rating method is well known and in the FAQ, looking at the pgn saves having to get the pen paper and slide rule out.