I used to sometimes see that happen when setting manual timers on the Wally, but I have not set very many manual timers on the Hopper Duo. I will try setting one up and see what happens.
Okay, I just tried it, and it works properly. When I was having trouble setting manual timers on the Wally, I found out that it helps to scroll down to the bottom of the list of timer settings and work your way up in reverse order. In other words, the channel number is the last thing I set, even though that setting is at the top of the list.
I forgot to ask if you were trying to set a DVR timer or Auto Tune. I tested the Hopper Duo by setting a manual DVR timer. I would usually have trouble setting manual Auto Tune timers on the Wally.