I noticed this, too. The game doesn't keep track of postseason stats from year to year. This page on the card is designed to let you follow how the player has done this year.
I took a look at the player editor that was out for v3. After poking around there, it became pretty apparent that the game isn't designed to track career postseason stats. Maybe it's a feature Markus will consider adding down the road.
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Shawn
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