This difference is caused by different dB values used in digital and analogue domains and in DAW recording programs.
Qu is operating at -18dBFS in the digital domain. This is normal and allows for headroom in the conversion stage to avoid clipping / digital distortion.
0dB on our LR meter equals +4dBu on analogue output.
DAW meters usually show values in dBFS (Full Scale) where 0 dBFS means the maximum value which can not be exceeded.
If the meters on the Qu show 0dB this will equate to -18dB in your DAW.
Here is another explanation: http://www.record-producer.com/what-is-the-difference-between-0-db-and-0-dbfs#.VO2jLfmsV8E
You can normalise audio after recording in most DAW programs.
For live streaming / web-casting, check if the program has an input trim or you could use a 1:1 ration and make-up gain in compression on your LR mix output.