My best guess is that Binar and Casella have very low handling or passing skills, leading to their getting 12 turnovers between them.
On the subject of offensive flow, the rules state that it is calculated principally by looking at the distribution skills of your point guard, scoring guard and small forward. The impact of the power forward and centre to this rating is therefore likely to be very small!
Plus, as moutlinho says, you could just have been unlucky.