When problems are confined to a particular channel, it may be that the channel didn't install properly, that it didn't update correctly, or that the installation has otherwise gotten corrupted. A reinstall may fix the problem, so give it a try.
Remove/reinstall procedure:
If the problem persists at this point, it typically means the current version of the channel app has a problem that must be addressed by the channel itself as they are the ones that create the Roku-compatible version of their app and provide it to Roku.
I have Roku built into my TCL Television. I subscribed, through Roku, to Britbox. I wanted to watch the new season of "Traces" which shows on the thumbnail in the app on my Roku TV, but it is not available. I checked on my AppleTV, and it is available, but I could not log in to my Britbox account with AppleTV and so had to re-subscribe with them. I cancelled my Roku/Britbox subscription and watched the program. Why are some programs not available at Britbox on Roku but they are available on my Apple TV? Why do I need Roku if the apps are not current with programming? Why did the thumbnail on Roku show season 2 but it was not available to watch?
@rdgerdes, often a subscription through Roku doesn't get you the same programming you'd get if you had a subscription directly through the provider. If you subscribe through Britbox and use that subscription on Roku you may have a better experience.