Higher mass flow rate at outlets as compare to inlet
 

Hi, I am working on two phase flow in a piping network consisting of one inlet and two outlets. I am trying to get the mass flow rate at outlet so that I could compare how much of inlet mass is going in each outlet. I am using eulerian model for my simulation and by two phases are air and water. The problems that I am facing are,
1. The sign of outlet mass flow rate is negative according to the graphs ploted by selected monitors
2. The mass flow rate at both outlets is actually higher as compared to inlet mass flow rate.
I am not able to spot the problem y its happening. I will really appreciate some help here. Thank you