From looking at achievements that were completed prior to HoT coming out. There are Hero Points that are supposed to be earned on various Story Missions for characters as well as joining the orders. The Mastery Points are missing for Story Missions / Joining / Completing the Orders if the missions were not previously completed prior to HoT release.
Please get this resolved asap as some users are stuck unable to move further in their Pact Mastery until this is completed.
Thank you.