Combustible as DPM problem
 

I'm doing coal combustion using PDF method.
I have two inlets through which both air and coal travel in together.
The Coal particles are given as combustible DPM injections at my two inlets.
I'm giving the total coal flow and selecting the scale the flow rate to face areas option.

Once my solution is converged, I'm observing that the DPM flow through both inlets is not equal and also the total injections through the inlets is less than the total flow I've given.

Any ideas or suggestions please?