The EEC should still control through two seperate engine parameters (EPR and N3 on RR, no idea about PW) depending on normal and alternate modes.
During idle, does the command cursor just sit "idly" on top of the actual (indicated) EPR/IEPR?
Seeing as the aircraft is trying to get down it isn't surpriseing the EPR command cursor is resting ON the commanded EPR which would be idle for a high rate of descent. It does look strange though..