When zoning in to Botanica and Mechanar, A’dal pops up a quest for players to accept. But, upon completion, prompt the player to go to Shattrath to turn in the quest. Then A’dal provides a follow-up to return back to those instances.
I think these were meant to be continuation quests that flag as complete and prompt a follow up when conditions are cleared.
Mechanar:
With Great Power Comes Great Responsibility > The Calculator
Botanica:
Saving the Botanica > Culling the Herd > A Most Somber Task
Arcatraz:
Unbound Darkness > Hey There Dalliah > Maximum Security Breakout
[edited in the complete chains]