Hello there.
When the actor is using a twohanded weapon, do they have something in their offhand, like a shield, or is that slot completely empty?
Is the two handed weapon tagged as <twohanded>?
Are you using the Monkey Grip extension, and is the actor monkeygripping?
I did fix a bug like this in a previous version but it may not have been the exact situation you have going on right now.
~Ramza

Here's the other one, still very much the same but it strikes all targets (i've assigned this one to shotguns) & has the action sequence stuff attached (I did this due to a problem i was facing last month where it would individually strike each and every target individually rather than all at once, and as I've stated, its only applied to shotguns)



(i tried adding in some of the extra plugins the DualWield Plugin had compatability, hoping that would resolve the issue, it sadly did not)
Something else i would also like to clarify is that the dual wield weapons are using the same notetag, so its not interchanging notetags with one another, in fact, i had to acutally alter this a while ago and remove a couple of weapons because i couldn't get them to behave like RPG Maker 2003's Weapons nor could I locate a proper solution)