Dude - seems you created a zombie channel!
When i did System / Update on one of my devices 5/1, it said it's installing "monster box" and then... nothing! It does not show in the channel list. The same happened on another Roku i switched to double-check. So the channel gets installed and is "loitering" my lineup - but i cannot see it (is not screensaver) and i cannot delete it. So it's neither dead nor alive, hence i term it "zombie".
Roku*, have you given consideration to things like this?
What is the way to deal with "zombie" channels - how can i (and other plebs) clean my account when things like that happen?
PS. Bonus "joy": ever since then, when i do a manual "System update", it tells me it's installing "Monster Box". Every time, again and again. Why am i stuck in a purgatory?