What site were these hands played on?
PokerTracker 3 is correctly picking up some additional hands that PT2 was missing
As for the timing, PT2 was ending your session at the time your final hand was dealt. PokerTracker 3 is adding some time from this point to account for the hand actually finishing. I believe this is the discrepancy you are seeing with the BB/Hour.
The rake seems a little off though. I believe there is an outstanding bug which is inflating the rake. If you could find a couple of hands where the rake is off that would help us tremendously. If you find a few of these hands, could you please send them to us via the [url=http://www.pokertracker3.com/support/index.php?cat_id=3mck]PokerTracker Support[/urlmck] system?
Best regards,
Derek