Problems with volumio primo and Musical Fidelity V-90 HPA

i’m buying a volumio primo a week ago and try to use it in three different ways.
First directly via RCA Outputs to my naim Nait3. Works fine and sounds good.
Second… use it with a Musical Fidelity MX-DAC per USB. Works also fine. the sound is a little more detailed but for me its to exhausting.
Third… use it with a Musical Fidelity V-90 HPA per USB. Don’t work. The hpa is recognized but the sound is totally distorted. What’s wrong? When i use the HPA with a laptop or Smatphone per USB everything works fine.

Thangs for helping me.