Just want to clarify my earlier post: this is happening with all melee weapons, including the Xoris. It is not limited to the Xoris.
Glaives make it more prominent, since the BR/WW/Glad buffs don't seem to notice the combo gain from the glaive bouncing around, but it's absolutely affecting all melee weapons. It's just that exalted melees make it obvious since the determinate factor seems to be whether you are actively hitting mobs with your equipped melee weapon within an arbitrary range around your frame. Glaives that have been tossed far enough don't "count" because, I suspect, they're