Not sure what device and version you are using because you didn't mentioned. But I have been using k1 plus combo on dvb-s2 since jarvis builds, actually on 801f and never seen such issue. Also tried dvb-t few days ago without single issue. Today dvb-t2 starts in our area so I'll also check that. Have you read through the all or at least first ? Maybe some tvh setup tutorial, there are many on youtube etc.
Took me a while to get around to this. Thank you for replying. Turns out it was just a silly frequency mistake on my part. I definitely need a course in tvheadend as it took me far too long to figure out the reason I couldn't see the audio stream filters! 