If you are the only one logged in and you are running at the console (text level) not the X Window level, i would have expected you to see 1 user.
If you are in X and have opened a terminal window to run top, then you would see 2 (one for the instance of 'you' that logged in and ran X, and another one for the other instance of 'you' that is running inthe terminal window.
(I'm no expert, but this is how I think it works.)
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