Try reinstalling the 777 (Repair), to see if that fixes the problem.

Note. The Navigraph AIRAC is based on the real world, and so on some airports, the ILS used by the AIRAC, are not the same used by FSX (it might be the same for P3D) for the runway you've selected to use. I saw that you can get regular cycle updates for the navigation data for FSX(P3D?), but you have to pay for it, just like you do for the Navigraph AIRAC updates.