Have you checked to confirm in your Cadwell's Almanac (in your Journal) that you have completed the key locations for each of the EP zones? By that, I mean that the Almanac will list the important locations (usually four or five) for each zone that you must complete in order to complete Cadwell's Silver/Gold.
Alternatively, if you check your Almanac and you see that each listed location has a completion checkmark next to it, you will want to open a support ticket and have the support team look into it for you. But check your Cadwell's Almanac first, just to be sure you didn't somehow miss a required location in one of the zones somewhere.
Hope this helps!