I have several tiles like this YouTube Tv tile that are missing the display telling me what channel it is. I have to scroll through to find the channels I want. Kind of a pain.
Have you tried restarting your Roku?
These things are just special purpose computers. Like their big brothers sometimes clearing things out by restarting them can correct problems. (For Roku TV users reading this: if you have "Fast TV start" enabled,, turning it off and back on just puts it into and out of a standby state and does NOT give you a complete restart, so use the methods below.)
Depending on your Roku model you'll find the "System restart" option under "Settings > System > Power", or on models without a Power option, under "Settings > System".
If a restart doesn't do it, or if you don't have sufficient control with the remote to navigate the Roku menus, you can also restart by pulling the power plug to the Roku for a few seconds then plugging it back in and waiting for it to restart.
I guess the next thing I would try would be to reinstall the affected channel.
Uninstalling the channel(s) should remove it/them from all Rokus connected to that same Roku account. To assure a clean reinstallation, assure the memory cache has been cleared on any Roku affected by this problem by restarting the Roku BEFORE you install the channel(s) back to your Roku account.