Got some issues combining EPG from XML feeds and the Over-the-air EPG's - Here's the details of the problem: https://tvheadend.org/boards/5/topics/33806
The TVHeadend boards seem pretty quiet - hopefully someone on Reddit knows a thing or two about configuring it.
Try combining the 2 xml files with this tool
r/ https://anonfile.com/19U0Z9f9b9/TVGuideCombine.zip
Usage:
TVGuideCombine [Output Filename] [Source Filename 1] [Source Filename 2]
Example: TVGuideCombine.exe tvguide.xml latin.xml usa.xml
This combines latin.xml and usa.xml to tvguide.xml