Wanderer's Palace (Hard) two times, Sastasha (Hard), Amdapor Keep (Hard)
Mobs in those dungeons will not give you exp at all save for if you were doing Roulette. I dont think any of the content you did... gives exp to a level 50+ players... You can only get exp from dungeons level 1-49 and from dungeons 51-60. I think that might be your problem.