The fact that you have old previous recorded shows probably explains why. I noticed this last weekend here in SoCal. I too have 2 Contour DVR's that I really wanted to have as separate Records like my previous systems. The new one now shows both under the Schedule and the new Recorded ON: does show my Family and Media Rooms, both my choices when I set up the system originally.
Even though we cannot tell the DVR onto which device we want to record, even when initiating the record from that specific device...so bad!. I think for one thing that the RecordedOn indicator is not accurate. I'm struggling to come up with a scenario that I can understand. I definitely find shows on the wrong column. Since, unlike a Host and client systems that most have, we cannot View recorded shows from the other DVR even if they appear under All or Family room.
Cox has indicated that the system looks at the amt of storage available on each box...something like that. But they go thru the effort of adding a new item that just shows you where stuff MAY be stored...but has no use. They need to add a SAVE On device, either at Record time, or during INFO where I can control the actual record. Join our club.