1st, what addon used?
2nd, did Kodi get "Updated" to Kodi version 19 (Matrix)?
*IPTVXtra will not work with v.19 (but your last playlist loaded in the PVR, will still function).
Check if you are displaying just 1 Category (Information/ Cinema etc.), or "All Channels".
/Shooty
I ve doubt in the category. ???
*Top left corner of EPG screen should say All Channels.
Update the TV playlist by opening IPTVXtra, select Yes to do an update, Select TV channels.
After it completes, shutdown and restart Kodi.
Hope that is the problem.
/Shooty