It could be that some of the tables on stars, still had the old vpp system even in 2010, and only new tables had the new vpp system, so for example, if you played a session from 11pm on the 31st till 1 pm on the 1st, and you were at the same tables, the u would be getting the old vpp, because the table has to die and close itself in order for the new vpp tables to take their place.