Trouble Getting Multiple Flow sensors working

I have been trying for weeks to get my Kegbot to work with multiple flow sensors. I finally plugged the Kegboard directly into my laptop to monitor the data coming back from the serial port and it’s not sending any meter updates when both sensors are connected. If I unplug one of the sensors, it will send the meter updates. Any ideas? I have been looking at the code here: but not sure if it’s the latest.