You may wish to try again. I did a search for the show on the WatchOptik website and selected the show to record and it scheduled the next 9 episodes all at 5:00AM on channel 100. I cancelled this and then tried my 4K PVR and had the same results.
The manual record is fairly limited. You may wish to post to the Ideas section of this forum to see if it could be improved.
Restarted, disconnected power and then restarted, gone back tried to reprogram the recording, and again from our other wireless boxes (same result, no surprise), and then from the Optik on the Go browser app... in all cases a series recording is created, but the scheduled recordings list is 1 instead of the many it should.
I don't think this is an issue with hardware or firmware or I would have issues with other content. But whatever... Suppose I will contact support... not that I expect the issue to be resolved.
I think I might just be better off watching on demand on the CBC Gem app.
I just tried the Watch Optik app and was able to successfully schedule multiple recordings. I did a search for "Grand Designs Australia" and two results came up. The first one didn't have any channels I could record on. The second one I browsed until I found the channel 100 occurrence. I selected this and was given the option to record only that episode or the series. I selected series and 9 episodes were scheduled.
Possibly you selected episode vs series?