People have different ratings for different time controls: chess.com displays one's highest rating by default, whatever that might be. When your game actually starts, the rating applicable to that time control is displayed.
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My opponent was 1631 after over a 1000 games. When we started, he had just lost his last game against a 1500 player. When paired against me in my current game, he is starting only rated 1359. What gives? I will be risking more rating points than I should. Thanks!