Looks like that was a 3 Season Series (according to Gracenote and MHz Choice, not thetvdb or Wikipedia).
Gracenote (zap2it.com) has it listed as two different shows.
One with a 12 episode Season 0
The other with 26 episode Season 0 and an 8 episode Season 3
They have two different id's
Were these recent recordings and were they all recorded using a single Series Pass?
If you can view json data in your web browser (example below is from Firefox), you can see what the FileID's are that are associated with the show by going to
http://x.x.x.x:8089/dvr/groups (where x.x.x.x) is the ip address of your Channels DVR machine.
Name "Forged in Fire"
Summary "Swords may not be the weapon of choice for many people nowadays, with more advanced weaponry readily available, but that doesn't stop some from continuing to work as bladesmiths. \"Forged in Fire\" tests some of the best in the field as they attempt to re-create some of history's most iconic edged weapons. Former Army Ranger Wil Willis hosts the competition series that sees four master bladesmiths challenged in each episode to forge the swords, which are then tested by a panel of judges consisting of J. Neilson, who has been making knives for more than 20 years, hand-to-hand combat specialist Doug Marcaida, and David Baker, an authority on replicating period-accurate weaponry. The contestant who survives the elimination rounds and wins the episode's contest earns $10,000 and the title of Forged in Fire champion."
You can also click the gear icon for each episode you find under recordings and View Details to get the file id and search for it in that json data to see which show it thinks they're associated with.
P.S. MHzChoice link
thetvdb.com has this entry for it
Tatort (English title: Scene of the Crime) is a long-running German/Austrian/Swiss (ARD (since 1970), ORF (since 1972) and SF (1990–2001, again since 2011)), crime television series set in various parts of these countries. The show is broadcast on the channels of ARD (DasErste, (reruns on regional ARD stations)) in Germany, ORF 2 in Austria and SF1 in Switzerland. The first episode was broadcast on November 29, 1970. The opening sequence for the series has remained the same throughout the decades, which remains highly unusual for any such long-running TV series up to date.