I don't think this is totally a Channels issue, because Plex has the same problem. But I have noticed that the channel guide for National Geographic is often incorrect. I have verified that I entered the correct zip code. Below is a screen shot of what Channels shows versus what is actually on National Geographic right now. Thoughts?
Channels guide:
Correct guide:
If the guide is incorrect also in Silicon Dust's HDHomeRun View app's guide, then your best bet is to report the error in their forum: https://forum.silicondust.com/forum/viewforum.php?f=127
The reason is is that SD and Channels both get their guide from Gracenote, but SD is a larger customer, and a request for correction from them will get more attention than from Channels.