We have a very similar issue. We moved from Ohio to Arizona. We watch YouTubeTV through Roku. Although we set up everything to the new Wi-Fi and isp and usually watch AZ local channels, sometimes it switches back to OH channels. Note that the YouTubeTV guide shows OH time as well as OH channels. Note that YouTubeTV on my iPad, which does not use Roku, shows correct AZ time and channels. So it seems the issue is with Roku. Help?
For more information about that channel's features and functionality, you'll want to contact the channel provider support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.