I have installed a second FE CDU almost two months now, but I didn't have the time to play with it. I thought everything was ok, but only last night I did a flight from the F/O side.... I tried to fly from clearance till landing and vacate from the F/O side and I realized that the F/O CDU is not showing everything the CPT CDU does. For instance, LEGS are not the same as the primary CDU, ROUTE does not have the full flight plan, where as the primary does, and in general I can see a huge delay between the two CDUs, eventhough every input in the second CDU is imported in the FP and in the primary CDU.

Any advise on that ?

Is there something to do to fix this issue ?

I am guessing a software issue here...