Tvheadend

I've installed SD json grabber and this is working great apart from categories/genre ("content type") not being populated correctly. Looking at the EPG from TVH gui, I can see that some programmes do have this set, but not all. I'm particularly interested in movies, but this is missing. Because of categories/genre being missing for the majority, epg in kodi is not showing nice colours and genre is set to "other/unknown" which means the vast majority of programmes show up as grey.

From what I can see, Documentary and news programmes are ok and some "sports".