The guide data for channels 6773 (CMCUSA) and 6774 (CMC) indicates these channels play old TV shows. In reality, they both seem to be music video channels.
Not a big problem, since I now know I have no interest in these channels and can hide them. Just thought I would report it.
I noticed the problem too when older movies that I was actually interested in were recorded within the scheduled times but ended up getting music videos. 
I found the root cause: they are mapped to the wrong channels.
It doesn't look like this mapping can be changed by the user (I tried).
Probably @tmm1 can fix this.
Thanks will fix in next build.