The Dreighan weekly quest for 250 spirit dust has a typo.  You updated the quest and it's rewards however the scroll you right click on still says 150 spirit dust.

All 4 of the scrolls echanged for Gerez Mercenary Office scroll list the reward as 150 spirit dust.  Once you accept the quest the reward however does say 250 spirit dust, at least it does from [[Scroll] Specter in the Sunlight].  I can't verify if the other 3 versions have the proper reward because I only have the current one.