Here is an example that will show the problem:
This is an episode of Kitchen Nightmares that was recorded on Fox. At the time, I had the channel mapped to #5.
Since then, changes to my sources have been made and today channel #5 is not Fox anymore but a virtual channel for the show Judy Justice.
So the DVR saves the channel number with the recording but apparently not the channel name.
And now it makes it look like the episode was recorded on different channel.
I wish it also saved the channel name so that it can display the right channel name even if channel lineups change after the recording.