1) A large number of Sacrifices and Sacrifice Flies would add Plate Appearences with out adding times on bases, accounting for the lower OBP.
2) I believe the amount of stats used by OOTP for each calculation is different.
I don't believe the game stores all of these stats for the vs. Righty and vs. Lefty splits (this would be due to database size considerations) as a result you get the different (lower) values because not every time that the batter reached base was saved for the righty/lefty splits.
Hope this helps
Edit - fixed some errors on my part.
[ February 21, 2002: Message edited by: ScottVib ]</p>
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