I have had the guide do pretty much what you're describing, but only occasionally. At the moment, my 72 hr guide is fully populated. Like Blackbear, I'm not using the nfps version.
no idea what your problem is but i can tell you the program descriptions are there for the 72 hr epg.
i just loaded it but i dont use the nfps version,i prefer the non nfps version.
I have had the guide do pretty much what you're describing, but only occasionally. At the moment, my 72 hr guide is fully populated. Like Blackbear, I'm not using the nfps version.
disable live tv and clear the data under guide and general.
delete the cache_xmltv.xml in userdata...
in userdata/database delete the epg.db and tv.db files.there could be more that 1 file epg10.db,ect.same for tv.tv29.db,delete any that start with epg or tv with the .db file extension.
srart kodi and enable live tv.
that should delete possible corupt file,if that dont fix it i dont know what will.