Okay, so after 35k hands @ 2-4 on PokerRoom, I have managed a 1.9 BB/100 earn rate. However, after about 40k hands @ 2-4 on PartyPoker, i have lost money. The games appear to me to be much better at PP. I play a TAG game (15.5 vpip / 6% PFR / 2.50 PF AF). Any suggestions welcome. I am greatly confused here!

Thanks in advance.