I'm not familiar with the Airbus FMS. I am familiar with the MD-11 FMS, and it is somewhat similar. It too has the /FF+FQ format, which can be replaced by /FF or /FQ.
The FMS Guide says: "The flight crew ... may reinitialize UFOB by entering a new value (thereby deselecting the fuel quantitiy sensor)" with UFOB being Usable Fuel On Board.
So on the MD-11 it is possible to enter a value in the UFOB-field, and the resulting display would be xx.x/FF, just as in your picture.
Maybe the same goes for the Airbus?
But then, if neither you nor the guy/girl next to you entered this into the FMS how did it get there? And even then the question remains, why does the aircraft think it will land with more fuel than it thinks it has on board?
I give up.
Another good case against pilotless aircraft I guess.