I've noticed a couple of flights recently where the PDA site lists more people as having been upgraded than the upgrade list on CO.com does.

They show the same number of available seats, but the PDA site shows more of the first class occupants as having been upgraded.

Flight 1094 on 3/24 is one, and flight 1694 on 3/26 is another.

Does anyone know what could be causing that?

ETA: One passenger I know on 1094 on 3/24 was a battlefield upgrade and is listed on both. I believe one passenger was upgraded at the 72 hour mark for 1694, and they're not on the CO.com list.