missing episode of mystery road: orgin

We obtain Acorn TV through Comcast/XFinity. We have successfully watched many programs.  One of the latest we have been trying to watch is Mystery Road: Origin. We have been able to watch Season 2, Episodes 1, 2 and 3. When we try to watch Episode 4, we instead see Episode 7 of Season 19 of Murdoch Mysteries (guest star Sally Lindsay; episode title: Murder She Wrote).

We checked on

Episode 5 of Season 2 of Mystery Road: Origin and that does display play correctly.  We can tell that there is a gap in the story presented in Episode 3 and Episode 5. The summaries of Episodes 3, 4 5 that I can see on the Acorn TV website also make it clear that Episode 4 is missing when we stream

Please advise how we can view Episode 4 of Season 2 of Mystery Road: Origin without an additional charge.