I love the commercial skip feature, but it does odd things periodically especially when playing back Live with Kelly and Mark. I notice it will often skip toward the end of their first segment known as "host chat" when they are talking to a trivia caller. It may skip just before the trivia starts, for example, and start playback again at the next segment (first segment with their guest). For some reason I thought the service used commercial data from a 3rd party, but looking at the settings, it appears to detect commercials internally, so is this the best place to report such issues so you can troubleshoot? Thanks
Channels DVR includes the 3rd party program comskip to detect commercials.
On some TVE and Custom M3U channels, it uses the Smart Commercial Detection instead of running comskip on the recording BETA: Smart Commercial Detection for TVE & Pluto.
There is a rudimentary Commercial editor available in the Channels DVR Server web UI
Recording > 
Options > Edit Commercials
and in some clients to edit the commercial blocks detected.
I saw this "issues" page GitHub · Where software is built but they seem to be talking pretty technical stuff. I don't see anyone reporting errors with particular TV shows, but please correct me if I'm wrong. My issue is recording off the antenna so I assume it is comskip like you said. I have seen the commercial editor, but it always seemed like a lot of work for something I'm going to delete after watching. Easier to just manually skip back if it is not something they can fix.
It’s not skipping at the wrong times, it’s indexing badly. If you look at the timeline, you’ll see that it’s skipping at the markers indicated.
Commecial indexing in Channels isn’t perfect. Broadcasters employ a lot of tricks to confuse commecial indexing. But it does pretty well. It’s up to you how to utilize it. There are many settings to disable commercial indexing on even a show by show level.
Also, as mentioned, you can even edit the indexing to make it perfect for your recordings, if you want.