Blizzard
Last week, there was a bug active for approximately half an hour that resulted in a small number of players receiving an extreme amount of Artifact Power from completing Island Expeditions. While this error was on our end, the amount of Artifact Power given was far too high to leave as-is, as doing so would give an unfair advantage to the handful of players that happened to queue for Islands while this bug was active.
To that end, we have been working to identify and isolate these incorrect Artifact Power gains and remove the additional amounts that should not have been given. Players who were affected by this bug will instead be granted the amount of Artifact Power that would have been correct for the Island Expeditions they completed. This action has now been taken, and affected players will notice their total amount of Artifact Power has been reduced.
We apologize for the confusion and frustration this has caused, and remain committed to providing an equal and fair environment for our players.