Tvheadend

EPG source is dvb-s2 OTA, using EIT grabber and viasat baltic only.

It depends what is broadcasted :-) At the moment TVH does not extract episode info from EPG strings only from XMLTV/PyEPG grabbers (and opentv using regex).

i see, i have used the internal grabber earleir with tvh, xmltv norway beta with the modified url.
it might be that this epg data is origination from internal xmltv, anyway there seems to be some mismatch with the datasets

Sure. That's what broadcaster provides. The DVB standard does not define episode/series info, so providers stores them to strings which may be parsed with a heuristic method.