Kivlehan,
I'm so sorry the response to this issue is so late.
Can you tell me, are you still experiencing this problem?
The team abbreviations in OOTPB must identically match the team abbreviations in Lahman. For example, if OOTPB says "NYA" and Lahman says "NYY," then there will be a mismatch, and the players won't import correctly.
That would be my best guess.
Please let us know!
Steve