So, everybody knows now that dual wielding alternates between hands with each attack, right?
Well, what happens is, if it's your offhand's turn to attack, and you look at what changes if you add a shield or quiver or whatever, the game doesn't have the presence of mind to say "oh that would turn off dual wielding and go to normal, so here's the dps change if you do that."
It just thinks you're going to put on a shield and swing it at shit, lol.
It's actually somewhat useful, you can compare how big of a difference you're getting between hands by shooting/swinging/whatever once to look at the other hand's dps.
XI Wiki



