I have the CXN 60 and also do not have that issue. It may be something in the interface between the CA and the preface. Did you send a message to CS customer support? I found them very helpful
Cambridge CXN
I use this for a streamer and listen to a lot of internet radio that shows 192K that the CXN supports but noticed on my preamp that no matter what the stream, it always shows 44.1K.
My preamp is also supposed to support the higher number using the coax digital input but never does. Spotify is the same way so not sure what's up. Any ideas please?