Bovada Refresh Better Odds?

I'm playing Bovada's single deck blackjack game in practice mode. I find that if I refresh the page after winning one betting unit (essentially starting a new game session), that I win more betting units over time. Is this an anomaly? Could be that the practice game has slightly better odds in the beginning to attract new users? If the deck reshuffles after every hand, then shouldn't my results be the same if I stayed in the same game, instead of starting a new one every time I go positive a betting unit?