I noticed I have some "missing spots" on the Story page, but I'm not sure if it's because I don't own the two most recent expansions or if it's because I've not logged in during certain times.
Basically I have "No Quarter, Jormag Rising, Champions", followed by End of Dragons (with Convergence, ..., What Lies Beneath, ..., What Lies Within, Interlude); finally there's Secrets of the Obscure (with Prologue, ..., Duress, The Survivors, Heitor's Gate). The dots is what I'm seeing, they're not there for the sake of brevity.