I have a booking in Economy Saver (out) and Business Saver (return). By the rules, Saver upgrades are only available 24 hours before departure. I'm a few weeks away from departure, yet MMB shows an available J>F upgrade on one of the legs, and the upgrade cost shown is the Flex upgrade miles (not the higher Saver miles).

It isn't the leg I want to upgrade (saving up for a different leg to become available), so I won't click through, but curious - is this an EK IT issue? Or is there an explanation?