Not sure if you guys have a fix, but I’m also stuck at 164/165. All my other explore titles were at or above the point they were lowered to, but Maguuma is still sticking. After the patch, I revealed both the Golemagical Institute and Calx’s Hideout, but neither of those added a point to my title (it should be noted, I had been to both on my Asuran character, just not on the Sylvari who has revealed the rest of the map).