Weird issue.
So I went to record a local channel (621). It comes up on the guide on Apple TV, but not in DVR to record.
Also, it shows up on the DVR interface as a channel (using on synology 716+II), but not on the guide on the interface.
Attached are screenshots and a couple pictures from the Apple TV version. (Click on the picture and it'll bring up an album) As you can see, the record button comes up when watching Friends but not on the Local channel. Also shown, it missing in the guide but showing on the channel list.