Topic: UCX - Input Phase offset problem

Lately I've measured my new RME interface, just to prepare it for a gig and the measurement got my attention.

http://preview.ibb.co/jdpNrQ/phase.png

Configuration Smaart v7:

pink noise generator => output #6 => TS-TS Cable =>  Mic input #1
Reference in smaart was made by output #6 Totalmix loopback

Is it normal that frequencies between 8kHz - 17kHz have almost +30 degree phase offset ?

Thank You for response.